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