Transpiration is a term used to describe how plants absorb moisture and release the vapor into the atmosphere. What better term to describe our lineup of 100% polyester tops that are designed to move sweat away from the body and evaporate into the air. The result is a t-shirt that keeps you cool and dry while limiting your stench factor. Just think, you'll finally be cool and smell fresh! See, we care. Our new Transpiration with GEO cool helps regulate body temperature and reduce overheating while you work hard and play hard outdoors. What customers love: extremely soft and comfortable, body feels instantly cooler, fabric wicks moisture away.