About 2 months ago I saww my friend wearing a Under Armour shirt, I did not think anything of it at the time, but then read about the technology in this clothing. I didnt believe a shirt could stay completely dry when you are out working in hot,humid weather, but I got tired of my regular t-shirts getting soaked in sweat after just a short time working outside, and decided to take a chance and give them a try. I was shocked, these shirts do stay completely dry and when you get a slight breeze it actually feels cooler than it really is! I would highly recommend anyone working outdoors in the heat should try this brand.I bought the loose fitting T-shirt, but they do make tight fitting shirts as well, but I assume you have to be in perfect shape to wear these.Also DO NOT buy the new shirts marketed as feeling like cotton but reacting like Under Armour, these shirts get visibly wet from sweat very quickly! I returned it and bought the original type. They cost around $25.-$35 but well worth it. It is even possible to get your company logo/name embroidered or silk screened on it. This company makes shirts,shorts, clothing for cold weather and even underwear! You will throw all your cotton shirts away after trying these.