Multi-directional stretch-rib panels in the knees, back, upper-seat and throughout the inseam. Mesh panels on the back of the knees and shins. Leather heat shield panels with DuPontT Kevlar® stitching.Full-Floating durable seat surrounded by stretch-rib material moves naturally with your body. Ergonomically pre-shaped and vented knee contoured to accommodate most knee braces and guards. Exclusive zipper lock system keeps pants closed and secure.