About this item 100% Polyester. The fabric rating UPF 50+ protects your skin from the harmful UVA/UVB rays,keeping you cool while outdoors in the direct sunlight. Raglan sleeves and no tag collar/flat-seam construction ensure a full range of motion and help reduce chafing. The thumb holes keep the sleeves in place and give extra coverage for sun protection. Lightweight,yet breathable fabric wicks moisture away from your skin,to be comfortable and fresh all day. Relaxed fit offers casual comfort by itself,great for running,hiking,fishing,biking and all kinds of outdoor activities.Machine washable.