Like a t-shirt, but tougher. Made in super soft 10oz stretch cotton jersey. The Muscle Tee has a teeny tiny cap sleeve making it basically sleeveless and a curved bottom hemline like a baseball tee. + 95% Cotton / 5% Lycra + Wet Printed Textile + Care Instructions: To help preserve the quality of your garment, only wash when it truly needs it. Then, turn it inside out and hand wash with cold water and a gentle detergent. Line dry.