Acacia Good Vibes Only Ultra Cotton Sleeveless Mens T-Shirt 100% cotton 100% Pre-shrunk cotton. Sport Grey is 90/10 cotton/polyester and Safety Green is 50/50 cotton/polyester. Seamless collar, hemmed armholes. Quarter-turned Double-needle stitched neckline and sleeves Proudly designed and printed in USA Wash Inside Out with Cold Water. Hand dry recommended.