AERO|TECH|DESIGNS Short Sleeve Compression Shirt UPF 50+ Soft and smooth 84% polyester/16% spandex fabric blend wicks away moisture Comfortable five-thread flatlock seams allow for ample stretch to provide muscle support and compression Adult Sizes: Small 34; Medium 36; Large 38; X-Large 42; XX-Large 46; 3XL 50; 4XL 54 ; 5XL 58; 6XL 62 (Note: chest measurements are in inches) UPF 50+ ultraviolet protection, tagless label, reflective logo 3 color options; also availalble in long sleeves and tights