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The Skin Cooler Longsleeve is a full sleeve triathlon top; skin-tight, and zipperless. It's created with our Skin Cooler 90 fabric and features 3 vertical pockets to keep you cool and comfortable while protecting you from harmful UV rays. It's a MUST-HAVE top for any warm-to-hot weather activity.

Sizing: Please refer to the size chart button above for sizing guidance.  
Fit Type: Form fitting
Fit Note:
 Please do not assume your size, please use our size chart. If in doubt, email questions to Triathlon apparel is meant to fit next-to-skin. This is to eliminate potential chafing, and unnecessary drag during the swim, bike and run. If you’re not comfortable with this type of fit and or are between sizes, we recommend sizing up. Garment will fit the most snug the first time you put it on, it will relax slightly once wet.

You asked, we answered and we are currently producing 2XL in LSSC, available early-May.

Favorite Features Remain

  • Skin Cooler 90™ stretch fabric blocks 90% UVB rays while creating a cooling sensation that actually keeps you cooler
  • Cooling technology is embedded in the fabric and will NOT wash out, contrast difference to many other "like" products on the market
  • Our longest length top for those with long torsos or in need of more coverage
  • Long sleeves for cooling and sun-protection on the arms
  • Three vertical pockets for nutrition gels, ice, or cold sponges commonly available at aid stations in triathlons and long endurance races. Pockets line up along your spine and are designed to help your cool your body. 
    • You might be use to only using the lower pocket of your current jersey, but you will quickly find the upper pocket to be great for carrying sunglasses, a cell phone or your mp3 player
    • The center pocket may require the help of the aid station or a bit more flexibility on the part of the wearer
    • The pockets are not designed to carry excessive weight such as water bottles, gel flasks, or any comparable weight
  • This is not a compression garment, yet it is supposed to fit snug, for aerodynamic purposes. Though it is designed to be worn alone and performs best that way, you can wear it over or under any triathlon top, tri suit, cycling jersey, golf shirt, or tennis shirt, and you will actually be cooler!
  • Offset seams eliminate the potential to chafe
  • This garment is not designed for repeated use in a chlorinated pool
  • Made in the USA
  • We are often imitated.  Remember just because it is white, it does not mean the fabric will cool you.  READ ON!


What makes ours different?  Our Skin Cooler fiber is designed to feel and perform like silk (from a silkworm).  Through Biomimicry, we took the virtues of this natural fiber and created a synthetic silk.  It will keep you cool in hot weather and cooler when it is wet.  Put it on and you will instantly feel the cool sensation.  Wet it and you will notice a drop in the surface temperature of the skin between 7 and 10 degrees.

 We received this letter from Dermatologist and Mohs Surgeon Dr. Michael Bax.* 

 I am an avid runner and triathlete and I recently discovered your Skin Cooler products, of which I'm a huge fan.  I have been wearing them for a few months now and couldn't be happier.  I am a dermatologist and Mohs surgeon at Roswell Park Cancer Institute in Buffalo, NY.  Every patient I see is plagued by basal cell carcinoma, squamous cell carcinoma, or melanoma.  I recommend your products to my active patients on a daily basis.  It allows them to continue their active lifestyle while protecting themselves from the sun. I find your product to be far superior to all other cooling and sun protective lines.  I truly appreciate your efforts and innovations. 

Michael Bax, MD 
Roswell Park Cancer Institute 
Scott Bieler Clinical Science Center 
Buffalo, New York

***Dr. Bax has no financial investment in De Soto Sport and was not solicited nor compensated in any way for his letter.

Note: No garment should ever be a substitute so we always recommend you wear sunscreen underneath these, and all, products. It is crucial to keep in mind that a sunscreen's (whichever brand you may choose) SPF/UPF rating refers only to its ability to protect skin from UVB radiation. Because we know that UVA damage can be just as insidious, it is essential for the health of your skin that you use a sunscreen that contains the UVA-protecting ingredients of titanium dioxide or zinc oxide. 


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Customer Reviews
4.8 Based on 47 Reviews
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Jim L.
United States United States
Amazing shirt!!

A good friend recommended the Skin Cooler Long Sleeve Top when we were mountain biking through the summer. In mid-August, I purchased two of these shirts before heading on a trip to Moab. It was 100+ degrees all week and the shirts were absolutely amazing! It felt like I was wearing an air conditioner. I highly recommend these to anyone and everyone!

Dan E.
United States United States
Excellent shirt!

I really like the shirt, but runs very small! Not close to reall XXL.

De Soto Sport

Hi Dan, Thanks for your feedback. In the future please use our sizing chart that is attached to every product. The top is meant to fit next to skin to work (cool) the most effectively.

Jordan L.
United States United States

Loved the fit, material is incredible and I’ve got several variants now. Love that it’s made here by hand in the USA

United States United States
These shirts work!

These are truly the best shirts for cooling effect in really hot weather. Bike rides in 100 degrees plus is no problem with these shirts. Just wish they came in solid bright colors. Would highly recommend these!

United States United States
This shirt makes me really cool*

I run hot. I don't like to wear a shirt when I run and go shirtless down to about 60 deg. High heat is my Achilles Heel. So during these summer months, long runs mean figuring out how to deal with the extra UV and the heat. The Skin Cooler Long Sleeve is the answer. I was a bit skeptical about how cool I would feel while wearing something over my skin but however the science/magic works it works quite well. I like being able to throw this thing on and not deal with sunblock (despite their warning to still wear it). Fit for me is a bit long as they describe. I'm 5'10" and 159. Its a bit long for me - I could do with a few inches shorter, but the extra material isn't that problematic. I'm wide chested and have arms like a spider monkey. Arms fit ok but a tiny bit tight around the armpit/shoulders. Still completely fine though. I've run 90 minutes with it and had zero chafing. I often to a bike-run-bike - ride to my nearest trailhead and run. When coming back after the run and getting extra airflow on the ride home you get a real cool blast. I like this shirt so much I bought a second one. Instructions are cool water only and line dry. I'm throwing it in my regular wash at warm and hit it for a few minutes in low temp dryer. Seems to be fine so far.


  Height Weight Waist Chest Hips
X-Small < 5'6" in / <168 cm 135 lbs / 61 kg 22”-24” in / 56-61 cm < 37” in / < 94 cm
Small 5’6”-5’8” in / 168-173 cm 145 lbs / 66 kg 24”-27” in / 61-69 cm 37”-39” in / 94-99 cm < 34" in  / < 86 cm
Medium 5'9" in / 175-180 cm 165 lbs / 75 kg 27”-32” in / 69-81 cm 39”-42” in / 99-107 cm 34"-38" in  / 86-96 cm
Large 6'0" in / 183-188 cm 195 lbs / 88 kg 32”-35” in / 81-89 cm 42”-45” in / 107-114 cm 38"-42" in / 96-106 cm
X-Large 6'2" in / 191-196 cm 215 lbs / 98 kg 35”-41” in / 89-104 cm 45”-48” in / 114-122 cm 42"-47" in / 106-119 cm
XX-Large 6'5" in / 197 cm+ 235 lbs / 107 kg 42” in +  / 105 cm + 49” in + / 123 cm + 48" in + / 121 cm +


The size chart above should serve as a general guide. If you would like assistance in determining the proper size, please send the following information to

WEIGHT - Accuracy helps us provide a more accurate size for you.
CHEST - Fullest part of breast, measured as the largest part of circumference right over the pectoral muscle.
WAIST -  Circumference measured at the belly-button line - this is NOT the same as your pants waist size.
HIPS - Circumference measured at the widest point, NOT at your hips where your belt may go. Typically this will measure just a few inches below your hip bones and around the largest part of the glutes.

If you do not have a tape measure and you need something to measure with, use a belt, or smart phone power cord, and a ruler.


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