The 1st Layer sweat-wicking shirts won't let anything get under your skin. The Microfiber fabric wicks sweat six times faster than cotton. It is anatomically designed for extended range-of-motion. Form-fit compresses muscles to reduce fatigue. Anti-microbial odor reducing barrier against the elements. Tagless collar and low profile flat-lock stitching for ultimate comfort. Ultraviolet protection factor of 30+. Ideal for year-round use. Machine wash warm tumble dry cool. For use in outdoor work wear under work uniforms or safety gear.