TOPTIE Men's Under Base Layer Gear Wear Shirt, Athletic Tank Top 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. Fitted design. 90% polyester / 10% spandex. Fast-drying, breathable functional fabric. Seams designed to 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. Four needle six lines of flat seams reduce chafing and rubbing as you move. Double-needle hem to make the shirts more durable.