High-performance base layer Designed to slim and streamline your body Breathable, stretch microfiber construction helps control body temperature Exclusive Helix Mapping Technology focuses compression to optimize your look Targeted ventilation zones Perfect for wearing under a work shirt or T-shirt Shoulder straps measure 2 inches 15 3/4 inch long sides (size M) The Equmen Core Precision Tank Top, from the Equmen Men's Collection, is an innovative base layer that actually slims and streamlines your look while offering support for your body. Made to fit tight to give optimum performance, this Equmen tank top was designed in conjunction with physiotherapists and ergonomic specialists to improve posture, reduce back pain and provide core support. Wear the Equmen Core Precision Tank Top under a work shirt or sweater whenever you want to be sure to look your best (for example: on interview days or your wedding day). Material: 73% polyester, 13% nylon, 14% spandex