Nike Mens Dri Fit Vapor Pro Hypercool 3.0 Compression Training Shirt Medium Mesh panels in key areas for breathability where you need it Ergonomic seams for natural range of motion Flat seams move smoothly against your skin Crew neck with interior taping for a comfortable fit Fabric: Body: Dri-FIT 91% polyester/9% spandex. Back panel: Dri-FIT 100% polyester. Mesh: Dri-FIT 93% recycled polyester/7% spandex.