4.25 oz, 87% polyester, 13% elastane heathered wicking knit with Coolcore technology; 50+ UPF protection; Wicks moisture; Coolcore is engineered to distribute moisture quickly throughout the garment. As the moisture spreads it dries faster and keeps you cool and comfortable, and has UPF 50 sun protection; Five-button placket; Contoured bottom with side vents; Set-in sleeves ; Tag-free