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Alpinestars Summer Tech Performance Long Pants
  • Alpinestars Summer Tech Performance Long Pants - Black
  • Alpinestars Summer Tech Performance Long Pants - Black

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Alpinestars Summer Tech Performance Long Pants

Alpinestars’ Summer Tech Performance underwear forms an effective base layer keeping you cool and comfortable under your suit during warm weather riding.


  • Comfortable moisture wicking material
  • Minimal seam stitching for ultimate comfort and performance
  • Designed to be 60% lighter than cotton, the construction is also hypoallergenic and antistatic
  • Muscle supporting compression fit helps support the rider’s muscles and reduces fatigue
  • Ergonomic flat lock seams
  • The underwear is designed to provide a tight, adaptable fit
  • Moisture wicking technology ensures ultimate comfort is maintained as well as a constant body temperature
  • Printed Astar logo on the front with Alpinestars print logo on the back
  • The shorts and pant all feature a male pant opening
  • Available from the Summer Tech Performance range are a long sleeve and short sleeve shirt as well as a tank top. In the pant selection, there is the choice of a pair of long pants or sports boxers

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 / XS-SM 505441 475269-10-XS/S/29400107 In Stock: Ships within 24 hours
Black / MD-LG 505442 475269-10-M/L/29400108 In Stock: Ships within 24 hours
Black / XL-2XL 505443 475269-10-XL/2X/29400109 In Stock: Ships within 24 hours


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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 Performance Long Pants 4 5 7 7
Nice product Breaths very well. Makes getting leathers off much easier. It does run on the small side and stretches a lot for those with athletically built lower halves. I'm only 5'6 and the large runs short trying to stretch it over my thighs and calves. October 15, 2015
good product but they run small I've worn these 2-3 times now in temps of the mid 80s under perf leather pants. They feel fine and certainly make it easier to get the pants off after a sweaty ride. They do run small. I'm 5'8", 30" inseam. Bought the M-L and they're just large enough. A bit short. Next time I'll get L-XL June 17, 2014
Great for summer riding & Track I bought these to wear under my leathers at the track and found that they are also great for wearing under jeans when out riding. Just like most Alpinestar gear it runs a bit small, I wear a 34 and got a large and it was still tight. Once I got out riding it wasn't that bad. I would buy these again but next time a size bigger. October 15, 2013
Solid Product I wear these in the Summer. Definitely better than other brands I have tried that could not hold up to robust use. These base layer pants fit on the tight side and so far are holding up really well. I ride every day and rotate 2-3 pairs and have been for over a season now. I do hand-wash them, however, as I don't want to risk sending them through a machine. The material feels nice against your skin and feel very good under your suit. Keep them away from velcro! The minute they touch velcro you will hurt the material peeling them off! I do wish the elastic in the waist was a bit better, but over-all these are very good base layer pants for Summer use and I will be getting more when these eventually wear out. May 15, 2013
Tight !! I can wear medium, had to use X-Large. Very comfortable under leather suit. Tight !! I can wear medium, had to use X-Large. Very comfortable under leather suit. April 22, 2013
A better deal than the matching top While I didn't notice much advantage over a cotton t with the matching top, I definitely found these to be effective and better than some "Comfortech" lightweight longjohns I'd tried under leathers previously. And the price is better than the top, too. Still kinda pricey. They're nice, but not extraordinary. July 18, 2011
Good product for warm weather riders These are really good under leathers for warm/hot days. They breathe well and keep the knees of you pants from binding as the day goes on and you get sticky. The ultra light material is a bit more comfortable than the UnderArmour compression shorts I had been wearing. My only gripe is I'd like to see slightly more robust elastic in the waist - but it's a pretty hair splitting gripe May 10, 2010
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Have a functionality, fit, or otherwise product-specific question about the Alpinestars Summer Tech Performance Long Pants? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.

Alpinestars Summer Tech Performance Long Pants
Already Asked: 1 Question, 11 Answers
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RevZilla Store asked: Why did you choose this?
Hwang S: needed something to wear under leather pants for ease of dressing and undressing. Jul 25, 2015
Gary S: To wear under jeans and knee guards in summer. May 30, 2015
Steven S: based on online reviews May 3, 2015
Mike A: so my boxers don't bunch up and to keep my balls cool Mar 17, 2015
Yang L: For comfort in summer heat of southern California. Sep 30, 2014
John S: Took a while to figure out size. Ended up ordering 4 different pair and returned the one's that didn't fit. Love these pants. They're tight at first but loosen up after time. May 18, 2014
Jeremy J: To wear under my alpinestar leathers Apr 6, 2014
Michael Q S: Big supporter of comfortable underwear to keep warm/cool, plus they have a front male opening (fly) which is really convenient as a couple of pairs (gifts) didn't have this simple feature previously. Saves getting half-undressed to just have a pee. Mar 31, 2014
kenneth m: mag, review Mar 25, 2014
Steve F: Needed a base layer under my Alpinestars A10 pants...these seem to be just the ticket for warm weather. Mar 12, 2014
Roger M: Always wear shorts. Wanted to try log pants and these looked the most comfortable but won't know until I wear them. Dec 27, 2013