The Run Performance Shirt is made with ultra-sweat wicking fabric to cater to runs in hot weather climates, designed to allow you to naturally ventilate during your run keeping you cool in the most extreme heat conditions. Properties:Sweat Wicking |High Coverage |Ultra-Breathable |Odor Control |Anti-Bacterial |Anti-UV |4 Way Stretch Model wears a Size Medium. See our fit guide to find your perfect size.