Virus Women's Stay Cool Short Sleeve X-form Posture Support Compression Top 82% Nylon, 18% Spandex Imported Ultra-wicking fabric construction keeps skin dry and comfortable Biomechanical x-form design reinforces good posture and form while in motion Compression pattern focuses compression's benefit, allows for range of motion and minimizes core restriction Advanced fabric keeps skin surface temperature up to 10degree f warmer UPF 50 offers great protection from harmful UV rays