Log In / Register
0 Checkout
Alpinestars Summer Tech Race Undersuit
  • Alpinestars Summer Tech Race Undersuit - Black
  • Alpinestars Summer Tech Race Undersuit - Black

Please select a Size to check availability, or to add this item to your Shopping Cart or Wish List.


Select Size:

Size Chart

Select qty:

Please select a Size to view availability.
Add to Wish List

Video Review

Alpinestars Summer Tech Race Undersuit Videos

Alpinestars Summer Tech Race Undersuit

Alpinestars’ Tech Race underwear keeps you cool and comfortable under your suit during warm weather racing and helps with getting in and out of your suit. Available as a 1-piece undersuit.


  • Designed for warm weather riding
  • Coldtack fabric construction
  • Micro perforated insert panel for comfort and breathability
  • Ergonomic flat lock seam construction
  • Compression fit design to reduce muscle fatigue
  • Off-set main zipper closure
  • Printed Astar logo
  • Leaf not included

Men's Base Layer Sizing

Euro USA Alpha US Pant Size Chest (cm) Waist (cm) Hip (cm) Thigh (cm) Inseam (cm) Arm (cm) Height (cm)
42 32 2XS 26 82-86 68-72 83-87 50-51 73-74 51-52 159-163
44 34 2XS-XS 28 86-90 72-76 87-91 52-53 75-76 53-54 164-167
46 36 XS-SM 30 90-94 76-80 91-95 54-55 77-78 55-56 168-171
48 38 SM-MD 32 94-98 80-84 95-99 56-57 79-80 57-58 172-175
50 40 MD 34 98-102 84-88 99-103 58-59 81-82 59-60 176-179
52 42 LG 36 102-106 88-92 103-107 60-61 83-84 61-62 180-183
54 44 XL 38 106-110 92-96 107-111 62-63 85-86 63-64 184-187
56 46 XL-2XL 40 110-114 96-100 111-115 64-65 87-88 65-66 188-191
58 48 2XL 42 114-118 100-104 115-119 66-67 89-90 67-68 192-195
60 50 3XL 44 118-122 104-108 119-123 68-69 89-90 67-68 192-195
62 52 3XL-4XL 46 122-126 108-112 123-127 70-71 91-92 69-70 196-199
64 54 4XL 48 126-130 112-116 127-131 72-73 91-92 69-70 196-199

Note: Alpinestars sizes displayed on our website are in Euro sizing, use the chart above to convert your standard US size to Euro. 

Sizing information is provided by the manufacturer and does not guarantee a perfect fit.

Click here to see the full Alpinestars Size Chart
Product Style RevZilla Item # Manufacturer Product # Availability
Black / SM 304073 475208-10-S/29400080 In Stock: Ships within 24 hours
Black / MD 304074 475208-10-M/29400081 In Stock: Ships within 24 hours
Black / LG 304075 475208-10-L/29400082 In Stock: Ships within 24 hours
Black / XL 304076 475208-10-XL/29400083 In Stock: Ships within 24 hours
Black / 2XL 304077 475208-10-2X/29400084 In Stock: Ships within 24 hours
Black / 3XL 304078 475208-10-3X/29400085 Available: Expect 1-2 business days lead time prior to shipment


Orders $39.99 and over qualify for our fast free shipping offer. Click Here for FREE Shipping Terms and Conditions.

Please see our International Orders page for orders shipping outside the US.

We show real-time availability on this product page when you select the size/color item you want.  Most items will ship the same business day an order is placed,however if an item requires additional processing time a message will be shown indicating such.

See our full Shipping Policy for further details.


If your order arrives and it is not right, we will we'll fix it, NO NONSENSE, we promise.

Doesn't fit or just not happy with it? You can return any new, unused and unaltered item within 30 business days of delivery receipt of your item. We will issue a full refund to your original payment method.

See our full Return Policy for all of the pertinent details.

Write a Product Review for a chance to win our monthly $100 giveaways.
Alpinestars Summer Tech Race Undersuit 4.7 5 32 32
What you need under your full suit Fits great and is awesome under suit! If you wear a one piece suit, you need this in your life October 5, 2015
Nice fit I usually wear XL in shirts because I like a loose fit. I purchased this suite in medium because I wanted an almost skin tight fit to stay in place and not roll up underneath my race suite. The medium fit was perfect for me. Tight but not too tight, it feels comfortable like wearing comperssion fit clothing July 16, 2015
Comfortable Works well under the race suit. Stretch material is comfortable. May 26, 2015
This product fits& works great Great baselayer, stayed cool and comfortable while riding canyons in California on a hot day, very easy to slide leathers on and off with baselayer underneath, felt great March 9, 2015
Good base layer, minor issues Doing things again, I would probably go with the two piece version to avoid the zipper (the cloth layer that keeps it off your chest hair can fold over while zipping; if you don't notice it will result in some uncomfortable moments while riding). The ends of the sleeves are a little bit loose. I wish there was more thickness/airflow/something under the back protector plate. Otherwise its pretty good. November 10, 2014
Works as described I have not been to a really hot track day with it yet so that will be the true test. But I have had a good experience with it at the two track days so far. It seems to run just a bit big on me. November 10, 2014
works, does what it says and looks sharp, at a price Great product, keeps me cool under my one piece, just can't wrap my head around why that little logo costs 80 dollars more than say an under armor logo. I think Alpinestars is good, branding is nice, but just so expensive July 28, 2014
Great buy I bought my first 1 piece suit and found it difficult to get out if it once I was done riding. This base layer makes it a piece of cake to get out my 1 piece suit. July 14, 2014
2 3 4 next>>
Use our Product Q&A for a chance to win our monthly $100 giveaways.

Have a functionality, fit, or otherwise product-specific question about the Alpinestars Summer Tech Race Undersuit? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.

Alpinestars Summer Tech Race Undersuit
Already Asked: 12 Questions, 62 Answers
Sort by:
RevZilla Store asked: Why did you choose this?
Kyle M: Keep cool and dry Sep 22, 2015
Craig B: Going to my first track day and the salesman was so informative and helpful I had to purchase it. I felt it was the best choice and it was the largest. Aug 19, 2015
Reginald L: Purchased this undersuit previously and was satisfied with fit and quality so I've decided to purchase another one. Jul 16, 2015
Michael B: Needed a lightweight layer between my leathers and me. Zipper is well-placed. Offers some compression. Jun 14, 2015
Steven W: To keep me cool. Works great! May 15, 2015
Carlos Eduardo S: As the weather in Brazil is mostly warm throughout the year the summer tech race undersuit fitted really well to my needs on the road or track. You can actually feel when the suit is working on your body to provide a cooler sensation! It worked great everytime I wore to ride and it definetely serves its purpose! I do recommend this item! May 13, 2015
Timothy R: Makes getting out of my suit much easier, and keeps me cooler. Apr 25, 2015
Robert S: to get into my spidi warrior wind pro suit, no stick. Apr 15, 2015
James M: These are a must have for track days and canyon riding!! Or just because!! Apr 5, 2015
Andrew B: Seems like the right tool for the job to keep cool and keep my leathers fresh. Feb 23, 2015
Christopher E: To wear under my track leathers to make it easier to get the top half off between session.

Yes it works. Also like the two way zip to allow you to go to the bathroom #1
Sep 11, 2014
Seth D: need a sleeve if you wear a full suit Jul 17, 2014
R A: I always stock in my MOno Leather Suit Hope with this cloth will be easier.. May 19, 2014
Luis R: Great suit.

Specifically. I am 5' 7 " and about 150 lbs. the legs are a bit long and so are the arms sleeves but not a big deal. Its nice and stretchy.
May 6, 2014
Alejandro m: Hot weather/track days riding Apr 13, 2014
John P: Essential gear if you want to move easily on the bike - prevents hanging up on your suit/ Apr 7, 2014
Craig G: Good reviews, looked like the right choice. Mar 25, 2014
Lorena G: Excelent summer gear. Also to use at Gym as a baselayer under shorts and T-shirts. Nice style and Astar reputation. Mar 18, 2014
Bruce H: I purchased an Alpinestars race suit and was told these undersuits where the way to go and they where right certainly makes getting in or out much easier plus the breathability makes it much more comfortable. I had purchased some inexpensive shirts that theoretically was similar NOT. This suit is well made and very comfy a definite recommend. Mar 6, 2014
Eryk F: no more availability on europe :/ Mar 2, 2014
M A: To make track days more comfortable and less "sticky" Feb 21, 2014
Allen C: Since I have all leather gear now, I'll want something that can fit smoothly & snug underneath all the leather that I'll be wearing. Not to mention something that will help keep my body cool while under all that leather. A lot of good reviews about this product, I don't think i will be disappointed when I get the opportunity to try it out for myself. Alpinestars has yet to disappoint me so far. Jan 3, 2014
David H: Alpinestars rocks Aug 10, 2013
A shopper asked: Aloha! Which size would you recommend for the Alpinestars Summer Tech Race Undersuit to wear on track days? I'm 5'8", 190lbs, 40 inch chest, 36 pant size and 30 inch inseam. I'm looking for a suit to provide proper compassion, but without restricting my breathing when in a tucked position.

Apr 10, 2014
Answer this · Send to friends Good question? Yes (1) No (0)
Robert B: I'm 5'11" 150s 33" inseam and I were a size medium. It is suitably snug without binding. The material is very stretchy but is lighter than a lot of the compression clothes I wear cycling. I suspect a large would be called for, although the legs might be a bit long. Probably not an issue because the material is stretchy and comfortable against the skin so a little bunching at the bottom wouldn't matter. You definitely want the undersuit snug so it helps you slip on your leathers without binding. This one does that very well Apr 11, 2014
Reply to Robert Good answer? Yes (0) No (0)
John P: You gotta go large and then maybe hem up the ankles

I am 150 # 5' 10", waist 33" & medium is tight all over for me, I have a size large also for when my weight (in the gut) goes up to 170 / waist 36.

I like these nylon/lycra suits - they allow easy movement underneath riding clothes / suits.

Bodyglove (I think) makes a similar suit for under a wetsuit. Alternatively, buy slippery separates. Underarmour and Nike make compression clothing in synthetic materials.
Apr 11, 2014
Reply to John Good answer? Yes (0) No (0)
Todd W: The under suit is very Flexible and not restricting. I would be concerned with being tight. I am 6ft, 220, 36 waist, 46 chest and the large fits fine. I alternate between this suite and a RS Taichi version. It really help getting in and out of a full leather suit. Apr 11, 2014
Reply to Todd Good answer? Yes (0) No (0)
DAINESE U: you're going to have to try either a size M or a size L
I'm same hieght, but weight is probably 175lbs. and wear 30 inseam jeans and 34 waist. and size M fits me perfect.
Apr 12, 2014
Reply to DAINESE Good answer? Yes (0) No (0)
A shopper asked: Which size should I get if I am a size 52 on a Motegi 2-piece race suit? May 12, 2014
Answer this · Send to friends Good question? Yes (0) No (0)
Robert B: I wear a Spidi leather suit size 50 and I wear a size Medium in the Tech Race Undersuit. For reference I'm 5'11" and in the low 150s. Suit is properly snug without being too short. The off-set zipper at the collar is a very nice feature. May 13, 2014
Reply to Robert Good answer? Yes (0) No (0)
Richard W: I'm 183cm (6 Foot) tall and 95kg with broad shoulders so I went with the Euro 52 and it fits perfectly. There stretchy so give a bit. May 13, 2014
Reply to Richard Good answer? Yes (0) No (0)
Steven W: I bought a large and i wear a size 42 Dainese 1 piece race suit. It fits perfectly. Hope that helps. May 13, 2014
Reply to Steven Good answer? Yes (0) No (0)
Steven W: Sorry, I meant to say that I wear a 56 in the Dainese race suit and I wear a large in this. May 13, 2014
Reply to Steven Good answer? Yes (0) No (0)
Ronald B: I wear the same size race suit. These run very small. I have size XL, which works well. May 13, 2014
Reply to Ronald Good answer? Yes (0) No (0)
Matthew E: If you are a European 52 a medium will fit. May 12, 2014
Reply to Matthew Good answer? Yes (0) No (0)
A shopper asked: Hi mate. I have an Alpinestars Atem suit USA size 40 (was a little snug at first but now fits like a glove). What size do you reckon would be the go? Thanks. Matt Dec 15, 2014
Answer this · Send to friends Good question? Yes (0) No (0)
John P: If 40 is the chest measurement that is a men's medium. You would be 5'8" to 5'11 and maybe 150 - 160 lbs. Sorry you will have to do the conversions. If you are bigger than that then I don't know what the 40 is - Euro sizing? I think this question is better directed to the manufacturer or solved by google.

I am "medium" sized but I feel much more comfortable in a "large" suit of this type (skin tight suit), even if it is then a little baggy. So I would go up a size unless you are really squeezing into a race suit. BTW a tight fitting lycra suit works well under a wet suit also, if you are a surfer.
Dec 15, 2014
Reply to John Good answer? Yes (0) No (0)
Ali M: Hi Matt..

I bought a 2 piece suit size 56 and undersuite size L.. both fit perfect.. i would suggest you to buy M.. since it suppose to be snug..
Wish you luck..
Also, would recommend Dinese undersuite over Alpine.. as personal opinion.. feels better quality..

Dec 15, 2014
Reply to Ali Good answer? Yes (0) No (0)
Robert B: I wear Euro size 50 in Spidi and Dainese. My Astar race undersuit is a size medium and it fits snugly-- perfect for sliding on leathers or a touring suit. I'm 5'11" 153 lbs if that helps sizing wise. Suit is light and stretchy and should fit a US 40 just fine. Dec 16, 2014
Reply to Robert Good answer? Yes (0) No (0)
steve b: matt you have the right ideal. when the suit fits snug, it works better. keep you cool and when removing the leathers or other clothes, the suit helps everything slips off much easier. ride safe brother. Dec 15, 2014
Reply to steve Good answer? Yes (0) No (0)
Matt D: Thanks guys. Medium it is Dec 19, 2014
Reply to Matt Good answer? Yes (0) No (0)
charles b asked: Hi, just trying to figure out the best size to get. I'm 175lbs, 5 ft 8 in, 36inch waist, 42-44 chest, and a 30inch inseam. Do you think a large would be too big? I'm not as concerned with snugness to help with rider fatigue as I am with just overall comfort. Thanks charlie Jul 1, 2014
Answer this · Send to friends Good question? Yes (0) No (0)
Ali M: Hi Charles,

I am 5 10.. 220 lb.. about the same on the chest as you but waist is 38.. I bought large and it fits perfect..
When I bought all my stuff through revzilla; I used the charts and the result were perfect..

Really dont know what to tell you, if I may suggest; take large ..

Jul 1, 2014
Reply to Ali Good answer? Yes (0) No (0)
Kathleen H: I am 5'8" tall, 30 inch waist and 38-39 chest. 140lbs 32 inseam. I have a small and it's a bit big. Think you will be happy w a medium.
Jul 1, 2014
Reply to Kathleen Good answer? Yes (0) No (0)
Kathleen H: I am 5'8" tall, 30 inch waist and 38-39 chest. 32 inseam. I have a small and it's a bit big. Think you will be happy w a medium.
Jul 1, 2014
Reply to Kathleen Good answer? Yes (0) No (0)
thomas f: Large good b good Jul 1, 2014
Reply to thomas Good answer? Yes (0) No (0)
A shopper asked: To whom it may concern,
Not sure which would be the correct size undersuit for me?
Im 180cm's tall and weigh 154 pounds.
My chest size measures 38 inches or 97 cm's
Which size undersuit would best fit me in the Alpinestars Summer tech suit.
Yours Sincerely
Ion Siskamanis
Jan 19, 2014
Answer this · Send to friends Good question? Yes (0) No (0)
Anthony K: I bought size medium suit last riding season. I like the suit very much. As for size, I'm close to the same weight and chest as you but about 6 inches shorter than you. For me, the medium suit's arms and legs are about 5-6 inches longer than I'd like them. For your 73 inch height, the medium suit should fit great. Jan 24, 2014
Reply to Anthony Good answer? Yes (0) No (0)
Pete W: I'm 177cm tall, 40" chest and 175lb ... I got a medium and it fits great, I would go medium if I was you, if you go large I think it would be a little on the baggy side. I'm only 3cm shorter than you and I don't think that would be anything on these suits as they are pretty stretchy :-) Jan 28, 2014
Reply to Pete Good answer? Yes (0) No (0)
Ronald B: Ion,
They do seem to run small. I got a size large. I'm 69" tall and 165 lbs. Chest 40" waist 33". I would get the large due to your height, but if you want a snug fit medium should work for you.
Jan 23, 2014
Reply to Ronald Good answer? Yes (0) No (0)
John P: Probably medium - tight fit Jan 24, 2014
Reply to John Good answer? Yes (0) No (0)
Allen C asked: I was wondering because I can't tell from the picture but even though the description says that this suit is also available as a 1-piece, does that mean that the top and bottom of this suit are detachable to make the top by itself and the bottom as well? Or is the 1-piece option a completely different product on it's own page? I'm a little confused. Dec 25, 2013
Answer this · Send to friends Good question? Yes (0) No (0)
Carlos G: The option you see in this page is a 1 piece only. You can buy the top and the bottom separately through other pages. Great product by the way. Dec 25, 2013
Reply to Carlos Good answer? Yes (0) No (0)
Josh A: This is a single piece with one zipper coming up the chest at a slight angle. Dec 26, 2013
Reply to Josh Good answer? Yes (0) No (0)
DAINESE U: Its one piece suit, you can't detach the top from the bottom. Dec 25, 2013
Reply to DAINESE Good answer? Yes (0) No (0)
Allen C: Thank you all! That helps a lot. Dec 26, 2013
Reply to Allen Good answer? Yes (0) No (0)
A shopper asked: HOW DO I CLEAN IT? Sep 17, 2015
Answer this · Send to friends Good question? Yes (0) No (0)
Daine P: i just wash it in cold water with the rest of my black clothes. All in together with your recommended usage of powder on the box.
Put washer on delicate cycle and let the washer do the rest.
do not put garmet in a dryer, just let it air dry and try not to hang it on a line. try and drap it over a clothes horse or some thing like it. i have had mine for a year now and machined washed it several time and had no dramas.
best of luck.
Sep 18, 2015
Reply to Daine Good answer? Yes (0) No (0)
Fiona H: I wash it in the washing machine on a hot wash. I line dry it. However it once found itself in the dryer and icame out just fine. I was worried that it would have shrunk but it was ok!! Sep 17, 2015
Reply to Fiona Good answer? Yes (0) No (0)
Jeffrey M: Hand wash, mild detergent. Squeeze out excess water, air dry - throw it over the back of a chair (it'll dry overnight). Sep 17, 2015
Reply to Jeffrey Good answer? Yes (0) No (0)
Alejandro m asked: What size do you recommend, I use a Dainese 52 size race suit which fits ok (maybe a bit snug on upper body and loser on bottoms and legs)? Mar 9, 2014
Answer this · Send to friends Good question? Yes (0) No (0)
Ahmad S: I would recommend a size medium if your suit size is 52. The base layer should be tight, this helps ease muscle aches during long hours on the bike. Its a great cooling material easy to slip on and off. Mar 23, 2014
Reply to Ahmad Good answer? Yes (0) No (0)
John P: All of these suits are a tight fit for an athletic build, so you slip around easily inside your riding suit. Unless you are racing, I'd say go up a size for comfort. Mar 10, 2014
Reply to John Good answer? Yes (0) No (0)
Andre L: Just get a custom made suit dude. It will be a lot easier and you'll be a lot happier with the way it fits you Apr 21, 2014
Reply to Andre Good answer? Yes (0) No (0)
A shopper asked: Hi, Trying to figure out the size, I'm 5 ft 8 in, with a 30 inch inseam, 42-44 in chest, and 36 in ch waist, and weigh about 175. Tried to look at other answers? Jul 1, 2014
Answer this · Send to friends Good question? Yes (0) No (0)
Mike S: I think a Large should work...
I am 5"11, 32" waist, 44" chest, 170lbs, and a large fits me nicely. There is some stretch to the material.
Jul 1, 2014
Reply to Mike Good answer? Yes (0) No (0)
John L: If it helps, I'm 5 ft 11 in, 32 inch inseam 44 in chest and 30 inch waist and weigh 190 pounds and I got the large and it fits me perfect. Jul 1, 2014
Reply to John Good answer? Yes (0) No (0)
Aldo B asked: Hi, I have a 52 race suit, I am 175 Cms high an d weigth 71 Kgs what size should I buy? Mar 18, 2014
Answer this · Send to friends Good question? Yes (0) No (0)
Andre L: Well it all depends on if you will be wearing back and chest protection on the inside of the suit. So if you are a 52 & don't run back and chest protection, your an idiot. However if you do have a brain and use both go one size up Apr 21, 2014
Reply to Andre Good answer? Yes (0) No (0)
Bruce H: well im 6ft and 175lbs and I got a medium you weigh a little less so I would go with the small Mar 18, 2014
Reply to Bruce Good answer? Yes (0) No (0)
A shopper asked: my euro sizing is 42 and my body is an average (male), can you tell me which size will fit me? thanks Oct 16, 2011
Answer this · Send to friends Good question? Yes (0) No (0)
PeteFLUSA: 42 Euro sizing? I assume since you mention your body size that you are talking about race suits. My friend is 5'7" (170cm) 135 lb (62kg) and he is 50-52 in Euro Race Suits (40-42 US). I am 6'1" (185cm) 170 lb (77kg) and I wear 52-54 in Euro Race Suits (42-44 US). Most suit sizing charts seem to run a bit large, so we look for the nearest value, and purchase down a size.

If you have a accessible (nearby) motorcycle shop that sells race suits, go in and try a few on. Experts have told me that the suit should fit snug, and standing upright difficult as these were meant to fit those in a seated position. When trying the suit, make sure to emulate the riding position with the suit on, and make sure you can twist to the right or left with your trunk and with your legs. Again, the suit should be snug, but not restrict movement.

Tall people like me can make up for sleeve and inseam deficiencies by purchasing higher boots and longer gloves. If you are shorter, you may wish to try your typical riding gloves and boots with the suit on, just to make sure that the material does not bunch inside the shoe or glove, preventing proper closure.

I hope this is helpful!
Jan 3, 2012
Reply to PeteFLUSA Good answer? Yes (0) No (0)
AliB: I would recommend a size Large based off the information you provided. If you could provide us with actual measurements, we can make a more accurate suggestion. Chest, Waist, Hip and Inseam would be the measurements we need to provide an accurate suggestion. Nov 3, 2011
Reply to AliB Good answer? Yes (0) No (0)