I love this gear. It fits me very well and i've had no promlems with it thus far. I'm about 6'1'' and 200lbs, athletic build, got the large and it fits pretty snug to my body, which i like. It's not like wearing under armour, but it fits snug. If you like a looser fit, go up a size. I usually wear a base layer under and have the Arc' Teryx Alpha SV and Stinger jackets to go over which works great. I am not a cold natured person, but this top breathes well and I don't get too hot or too cold. Any person that wears this gear knows its pricy, but WELL worth the price. Would def. recommend this for others.