Black Bull Ladies Kevlar Denim100% Authentic Kevlar OF 250 fiber used in seat, hip & knee areas as shown in the picture Removable 2 PC CE ARMOUR for Knee Very Comfy Fit Look & feel like normal jeans, but are high quality heavy duty stitched denim is weight stretched for extra durability Kevlar is a soft non abrasive material designed to dissipate heat, its cut resistant (used in bulletproof vests) yet it allows the air to flow freely through the fibers. Heavy duty double stitching