Our most popular model, the long sleeve tee provides superior cooling when temps are hot, pulls moisture away from the skin, and gives you all day sun protection with it's UPF50 rating. DriComfort® GEO 365 mineral infused fabric controls temperature whether it's hot our cold, so use it year-round, over a tee, under a vest of jacket, or lounge around the house in comfort. Easy care wrinkle free and won't shrink when dried.