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Men's Coolest Cool™ Sleeveless Top


http://www.columbia.com/mens-coolest-cool-sleeveless-top-AM6578.html AM6578
$19.98 $48.00
Style# 1502601
Greater Rewards members earn 200 points with purchase
Size & Fit Guide | Reviewers rated this product Fits Slightly Small | Fit Performance


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Style# 1502601


The ultimate performance layer for high-octane activities in the heat, this sun-shading sleeveless top employs strategically placed Omni-Freeze® ZERO sweat-activated cooling technology and Omni-Wick® inserts to keep you cool, dry, and protected in the outdoors.

  • Omni-Freeze ZERO fabrication lowers the material’s temperature
  • Omni-Wicking pinhole mesh at upper back, under arms, and at side torso transmits sweat away from your body to keep you dry and comfortable
  • Omni-Shade UPF 50 provides premium protection from the sun
  • Antimicrobial treatment protects this product from bacterial growth
  • Ergonomic flat-lock seaming
  • Imported

  • Omni-Wick 91% polyester/9% elastane pinhole mesh inserts at upper back, under arms, and at side torso
  • Omni-Shade, Omni-Freeze ZERO 92% polyester/8% elastane jersey at front and back torso
Omni-Freeze™ ZERO
Sweat-Activated Cooling
High-Performance Wicking Fabric

Technology Videos

Play youtube video about Omni-Freeze ZERO (tm)
Omni-Freeze™ ZERO
Blue rings react with sweat to lower the temperature of the fabric, so you feel cooler.
Play youtube video about Omni-Wick (tm)
Pulls moisture away from the body so sweat can evaporate quickly.


Rated 3.7 out of 5 by 19 reviewers.
Rated 5 out of 5 by Great shirt for staying cool The shirt worked well for keeping me cool in the sun during a 24 hour endurance longboard race in Miami with temperature highs around 77 and moderate humidity. February 25, 2015
Rated 5 out of 5 by Plan to purchase more I wear these under my dress shirts when wearing a suit in warmer weather and when I'm hiking, biking or working in the yard in cooler weather - work great in all situations. Hands down better than similar Nike and Under Armour technology which I wore before purchasing these. These are considerably more expense than the other brands. February 2, 2014
Rated 5 out of 5 by Sweat Activated Cooling - APPROVED Use for Ultra marathons, Ironman triathlon, trail running.... Fits to body, no loose fabric for chaffing and gets nice and cool as long as sweat is present. I own all short, long, and sleeveless versions of the Omni Freeze Zero line January 30, 2014
Rated 3 out of 5 by shirt runs really small and and mediocre workmanship January 7, 2014
Rated 5 out of 5 by Sleeveless Omni Freeze Zero Awesome shirt under body armor. Snug fit. No irritating seams. Definitely cooler on a long hot night. Noticeably less smelly after long wear. Need a V-Neck so doesn't show under uniform. November 14, 2013
Rated 5 out of 5 by Sample Got a Sample sleave (For your forearm) At the state fair and found it worked really well!! Hope they come out with a beanie, That would be awesome!! To keep your head so cool!! I'm just not a baseball hat kind of guy! More of a Harley Beanie kind of guy!! But hey, it's all good!! August 24, 2013
Rated 4 out of 5 by Cool but not Cold This shirt helps minimize the effects of exercising outside in high heat and humility. Don't expect it to feel like walking into a cooler but I believe it helps keep the core cooler. August 5, 2013
Rated 4 out of 5 by It may look weird The shirt does a great job keeping you cool in hot weather. However, it doesn't look as white as the picture would suggest. The blue cooling rings are faintly visible and gives the shirt a strange look. My wife felt that it looked "kinda feminine". So if you buy this, make sure you plan to use it as a baselayer under another shirt. July 24, 2013
Rated 2 out of 5 by Save your money I wore this on my Sunday long run (13 mi.) in 90 degree temps, then again yesterday in 95 degrees. The only time I noticed it 'cooling' was when I sat in my car with the air conditioner blasting on it. The other thing I really dislike about this shirt is it doesn't wick. I ended up with it plastered to me instead of the sweat even trying to evaporate. I spent 1/2 this on a singlet and it is much better! This shirt is all hype. July 24, 2013
Rated 4 out of 5 by Watch sizing I am quite happy with the product over all. I used this during one of my Ironman Long Brick sessions (80 mile ride, 18 mile run). My only issue, I bought a medium in size. It feels a little looser then it probably should be? Sizing is the biggest concern I have with this product. July 18, 2013
Rated 2 out of 5 by Big Expectations Really didn't notice the difference in the "cool down" effect after a run outside in the evening for 4 miles. I guess I am a sucker for their marketing strategy.... July 17, 2013
Rated 4 out of 5 by poor results wasted my money. doesn't perform as advertised July 6, 2013
Rated 1 out of 5 by No what it is cracked up to be I was really excited to get the shirt in, as I shoot sports all year round. I could barely get the thing on. It is not tapered at all, especially for XXL. It is way beyond a French Cut shirt. I wore it outside doing yard work, under a cotton polo, but it was n ot better cooling me down than a good quality 100% cotton tee. I do not recomment this item. I guess they just tested it on high end athletes, and for got about us normal built Americans. June 21, 2013
Rated 4 out of 5 by Great idea Purchased this shirt to help control body temp while doing martial arts training and doing summer outdoor sports. As an under shirt it doesn't work as well as I had expected during the activity. From the few times I have warn it so far I can say with confidence that where this will shine is in helping you cool down after an activity and during outdoor activities where air can get to the shirt. June 11, 2013
Rated 3 out of 5 by Meh... Not sure it was worth 50$ I can't feel the difference from any other tech style shirt and the omni freeze. It's comfortable i guess. May 21, 2013
Rated 4 out of 5 by Works good The product works well but it is not tight enough. More skin contact would improve the function. Also there are some unnecessary unremovable tags causing itching. May 15, 2013
Rated 5 out of 5 by My Boyfriend Loves It! I got this for my boyfriend who refused to make any investment in workout gear. He usually used a wife beater and some basketball shorts. After I gave this to him, this is all he uses now. He has a very small waist (28-29") so I am always nervous about sizing but the medium fit him perfectly. He has very muscular shoulders and arms so the sleeveless was perfect and he loves wearing it. I'd highly recommend it! May 9, 2013
Rated 1 out of 5 by No cooler than any other shirt In Miami the humidity seems to have an affect on the cooling ability of the shirt. It is no cooler than a cotton running shirt. April 20, 2013
Rated 5 out of 5 by Men's Coolest Cool™ Sleeveless Top Fantastic. Will be used a lot this summer for Wildlife research. Very happy with product. April 19, 2013
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Size & Fit Guide

Size Chart

Size & Fit Guide
Men's Body Measurement (Inches)
Neck 14-14.5 15-15.5 16-16.5 17-17.5 18-18.5 19-19.5
Sleeve Length 32 33 34 35 36 37
Chest 32-35 35-38 38-41 42-45 46-49 50-53
Waist 26-29 29-32 32-35 36-39 40-43 44-47
Hips 32-34 35-37 38-40 41-43 44-46 48-50
Neck 17-17.5 18-18.5 19-19.5
Sleeve Length 35 36 37
Chest 42-45 46-49 50-53
Waist 36-39 40-43 44-47
Hips 41-43 44-46 48-50
How to Measure
  • 1. Neck: Measure at the base or thickest part of your neck.
  • 2. Sleeves: Start at the center back of your neck and measure across the shoulder and down to the wrist. Round up to the next even number.
  • 3. Chest/Bust: Measure at the fullest part of the chest, under the armpits and over the shoulder blades, keeping the tape measure firm and level.
  • 4. Waist: Measure around the natural waistline, allowing the tape measure to sit comfortably.
  • 5. Hips: Measure around the fullest part of your hips.
  • 6. Inseam: Measure from the top of the interior leg to the bottom of the ankle.
Men's Fit Guide
Body contouring fit conforms to movement.
Body skimming fit with end-use mobility in mind.
Modern Classic / Regular
Universal, easy fit for comfortable range of motion.
Most generous fit for a full spectrum of movement.

How to Measure

Columbia Fit Guide

How to Measure

  • Fold up at dotted line.
  • Place against a wall or other 90 degree surface.

    Place heel against fold/wall on flat level surface.
  • Mark the end of the longest toe with a pen or pencil.
  • Measure both feet and use the larger measurement.
  • Read measurement and compare to size chart.
  • When comparing on the size chart, determine the closest larger measurement and use that number to determine your shoe size for your country’s shoe measurement standard.

Shipping & Returns

Shipping & Returns

Shipping Information

Shipping Method Rate Expected Delivery Time
UPS Ground $6.00 3-7 Business Days
UPS 2-Day Air $12.00 2-3 Business Days
UPS Overnight $19.00 1-2 Business Days
Free Standard Shipping

Return Policy

Returns are accepted within 60 days of the purchase date online or in-store. Your apparel must be in original and unworn condition, with tags still attached. Footwear returns must also include the original box.

Still Have Questions

See our Customer Service section for more details. Visit Customer Service