3D leather knee panels backed with 600 Denier are designed to work with knee braces for riding feel, grip and control, while also delivering high levels of heat resistance and durability 600 Denier reinforcements on seat area provide seam strength, durability and coverage in a critical area Dual-layer 600 Denier knee panel for durability and freedom of movement Stretch mesh inserts at back of knee and leg lower aid flexibility, air flow and comfort when wearing MX boots Open mesh inserts are positioned to channel cooling air into the hip area and exit warm air at the back