The Joe Rocket Accelerator Jeans are constructed of a unique combination of heavy-duty denim, Aramid fibers, and Kevlar reinforcement.; ; 12oz heavy duty denim DuPont Kevlar reinforced in the seat, hip, and knee panels Aramid fibers are a class of heat-resistant synthetic fibers, used in aerospace and military applications, for ballistic rated body armor fabric and ballistic composites Pockets for knee armor (armor sold separately) Added cotton comfort layer Stretch panels at knee and upper seat areas Ride-friendly cut 7 pockets including 2 zippered pockets Reflective stripe on legs and tail bone