They counteract perspiration (absorb moisture). 1) I bought these to wear while sleeping on camping trips. They work so I don't wake up sweaty (which has happened with other synthetic shirts, but these wick moisture well). I throw and turn a lot on the other shoulder. So this shirt is easier to turn inside out as the material is smoother/smoother than cotton. 2) I also have it as a more moisture wicking layer and as a germ/smut layer to wear under my combat paintball shirt. It works for that. 3) About the size: Always refer to their measurements, not the label. Your XL = adult male "small" chest = 39 inches. The sleeves are a bit short but I think they're good because they don't restrict movement if you have big biceps. It's slim-fitting and stretchy, making it easy to wear under layers. I received XL according to my chest measurement (actual size as small Gidon cotton shirt). Also note that the length is about 10 inches below the navel. So this is a suitable jersey as it has extra material that can be tucked in. I love that extra layer so my army pants don't cut into my skin at the waist. So why did I buy these shirts instead of a $3 cotton shirt to set up camp? paintball? For reasons 1 and 2: wicks absorb sweat and cotton shirts absorb it (weight).
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