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From Fellrnr.com, Running tips
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File:UA HR BW (4).jpg| Where the white top is wet, the temperature is 72f/22c
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=Under Armour Iso-Chill=
Under Amour have a variation of HeatGear called "Iso-Chill." UA claim that Iso-Chill feels cooler to the touch and it will "''pull heat away from the skin, physically making you cooler''." I assume they mean the fabric will transmit heat more easily, but details are lacking. UA also claims Iso-Chill will increase the time taken to reach [[VO2max|V̇O^=2^ max]], but they give nothing to back up this claim. The only detail they do mention is treating the fibers with titanium dioxide, which is how I found Iso-Chill. There is research showing that titanium dioxide fabrics will reflect far infrared (heat) and improve infrared emissions. The idea is that you could have a fabric that's dark but reflects heat like a white fabric. I decided to try some Iso-Chill fabrics and compare them with regular HeatGear. I already have a white long-sleeved top, and I ordered a white Iso-Chill top, along with camouflage-black Iso-Chill leggings and mostly white regular HeatGear leggings. I used some regular black 2XU leggings for a worst-case scenario.
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File: UA IsoChill 1.jpg| The Iso-Chill setup. Left to right, Iso-Chill white top, normal HeatGear white top, mottled HeatGear leggings, Iso-Chill black camo leggings, black 2XU leggings.
File: UA IsoChill 2.jpg| The infrared view shows the garments are cooler on the left, rising as you go right.
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A simple evaluation is to lay out each item of clothing in full sun and see how hot the get. This is a bit artificial as clothing is normally in contact with a body, but it gives an idea of the heat absorption. The white Iso-Chill top was coolest, at only 25c, with the white HeatGear top are warmer at 29c, a surprising difference. The mottled leggings are 33c, which shows how much the small amount of black mottling changes the temperature. The camo black Iso-Chill leggings are a toast 47c, and the 2XU are up to 52c. So, the color is still the dominating force in the temperature, but the Iso-Chill helps. I've run in all these items quite a bit, and my real-world findings match the thermal images quite well. The Iso-Chill top is a bit cooler than the normal white top, but it's not a big difference. The black camo Iso-Chill leggings make a noticeable and worthwhile difference to the perceived temperature in full sun, and I'd always wear them over regular leggings if I was trying to stay cool rather than trying to stay warm. The mottled white leggings win out for hot sunning conditions if you don't mind the look. Generally, I've had a mixture of complements and odd looks with the mottled white leggings, so it will depend on your aesthetic tolerance which you chose.
