Ergodyne - EGO18300 Made of 840D Nylon, the 300 Short Hard Cap Knee Pads protect your knees from scrapes, bruises and minor injuries while working. Foam padding made with nitrile rubber (0.5"/12mm thick) maintains its shape over time while hugging the knee for added support. Hard cap allows swiveling and pivoting movements without restriction. Cap is abrasion-resistant for long-lasting wear. Nickel-plated, grommet holes surrounding hard cap and strap lining add an extra layer of protection so the hard cap stays in place. Straps in the back keep the knee pads in place throughout the day. Easily adjust strap comfort with the buckle closure. Short cap size doesn't hinder mobility because it only covers the knee. Pads are ideal for work that involves continuous use on your knees.