VIRUS Women's Stay Warm X-form Posture Control Long Sleeve Compression Top 88% Polyester, 12% 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 Works stand alone or in combination with outerwear