The Xcel Lycra short-sleeve rash guard offers UPF 50+ sun protection without the weight. More than 98% of UVA/UVB rays are blocked with this ultra flexible fabric. Features: - Waist loop that is able to attach to bottoms - Stretch waist - 8oz. Lycra with a 4-way stretch - UPF 50+ - Flatlock seams to prevent chafing