TOPTIE Mens Compression Sleeveless Base Layer, Athletic Workout T-Shirt Please check our SIZE INFO in description or picture rather than Amazon's "Size Chart" to pick a suitable size. Do you like a tight fit? Go for one size smaller than you usually wear. Want a loose fit? Go for one size larger. If you don't know what to choose size, please measure your current height and weight to contact us. 90% polyester / 10% spandex. Fast-drying, breathable functional fabric. Neck tape added for durability and comfort. Fitted design. Flat seams reduce chafing as you move. 90% polyester / 10% spandex. Fast-drying, breathable functional fabric; We&#039;ve made added durability in the neck so it won&#039;t lose shape; The round collar training singlet is ideal for a variety of training conditions; Flat seams reduce chafing and rubbing as you move; 7 Colors for your choice.