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Alpinestars Tech Race Bottom

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Alpinestars Tech Race Bottom 

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 or as separate top and bottom.


  • Cut for race use
  • Designed for warm weather riding
  • Coldtack fabric construction
  • Micro profrated insert panel for comfort and breathablity
  • Ergonomic flat lock seam construction
  • Relaxed fit design for comfort
  • Printed Astar logo

Men's Base Layer Pants Sizing

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

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 304055 475338-10-S/29400062 In Stock: Ships within 24 hours
Black / MD 304056 475338-10-M/29400063 Available: Expect 1-2 business days lead time prior to shipment
Black / LG 304057 475338-10-L/29400064 In Stock: Ships within 24 hours
Black / XL 304058 475338-10-XL/29400065 In Stock: Ships within 24 hours
Black / 2XL 304059 475338-10-2X/29400066 Available: Expect 3-4 business days lead time prior to shipment
Black / 3XL 304060 475338-10-3X/29400067 Available: Expect 3-4 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 Tech Race Bottom 4 5 3 3
A "Can't Do Without" Piece of Gear I swear by these things. We are in the Summer cycle here and it has been 80 + every day for almost 3 weeks now. The Tech Race bottoms and tops are comfortable, do an excellent job of whicking moisture away from you and help regulate your core temperature. They also make it a snap to take your outer gear on or off, especially leathers! I have enough of them to rotate as I ride every day, because I don't ride without 'em! Best to hand wash them and then just hang 'em up; they dry quickly, and if done this way they last longer. Keep them away from Velcro! DO this and you will be golden. July 31, 2013
Weird dimensions, NO FLY! Great to find long tights to be worn under leathers, and meant for hot temperature. But fit is strange, especially in area were legs meet groin, and THERE IS NO FLY! June 17, 2013
Great Product I purchased the matching top and it was excellent.(I left a review on that item also). I had originaly purchased the summer bottoms in Md/Lg which ended up being to small.Returned them for the summer race tech bottoms in Xl which have worked out great. I can't say much about how they will last but if you don't get to ruff with them taking them on and off I think they would last a good while.Everybody takes care of and treats their stuff differently.The change in wearing, and mostly getting in an out of my suit is great.It was muggy and 90 here today and the base/layer did great in my opinion. The description for the race tech summer base/layer is incorrect on here it list them as relax fit but they are a compression fit to help your muscles.I went to alpinestars web and got the correct info.I informed the person that I ordered from about the wrong info for the product but nothing has been changed as of yet.So check it out for yourself.I guess the guy I talked to didn't believe my info.I used the part numbers to get the correct description. Return was easy and money was returned to my card very quick. May 4, 2012
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Have a functionality, fit, or otherwise product-specific question about the Alpinestars Tech Race Bottom ? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.

Alpinestars Tech Race Bottom
Already Asked: 2 Questions, 4 Answers
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RevZilla Store asked: Why did you choose this?
Amber C: From other's reviews on this item, this seemed like the best choice. It's for my boyfriend (who is 6 foot 4), so I'm hoping I got the right size! Sep 17, 2014
Michael K: I spent a day on the track last year, and really needed something that pulled body heat away from me. I had the opposite of that, insulation that I have from skiing. SO, these do the reverse, pull heat and wick moisture away for a cooling effect. Still drink lots of H20 out there, but this will make the riding sessions a lot more comfortable. Jun 9, 2014
A shopper asked: I am trying to figure out what is the best size for me. I wear 34/32 pants and that seems put me in the MD size but i have never worn MD in anything so I just wanted to get and idea what you thought? I am 5 11 average build. I was thinking large would be best Mar 21, 2014
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Ghassan E: I wear 36/38 and use XL size and fits perfectly.
You should take the large one and I am sure it will fit you well if you are of size 34/32.
Mar 21, 2014
Reply to Ghassan Good answer? Yes (1) No (0)
Dennis M: You would be correct. These fit like compression pants so they are naturally a bit tight. But like everything A-Stars they run on the small side, so the large would be a better bet. I am a 38 waist and a 34 inseam and wear a 2XL in these pants. But I like them very much. It makes wearing any suit much more comfortable. Especially leathers! Mar 22, 2014
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