The OX Ultimate 4-Piece Leather & Nylon Construction Rig is tough, dependable and comfortable. The rig is constructed from a combination of 1680D ballistic nylon, memory foam and top-grain leather. Kevlar® is a key component to this set up. The rig includes Kevlar® reinforced double row stitching as well as Kevlar® OX - U268601 - Ultimate Kevlar Reinforced 4pc Construction Rig