100% polyester; 40 UPF on White; 30 UPF on other colors; Anti-microbial treatment prevents odors from perspiration; Wicks moisture and keeps the body dry; Double-needle stitching on sleeve and bottom hem for strength; Comfortable fit ; Sideseamed; Contrast colorblocking along shoulders; Self-fabric collar and tagless neck labeling; Neck seam has double-needle front stitch & overlocking back stitch for strength