The 5.11 A / T 8" AR 670-1 boot is built for the most demanding missions. The All Terrain Load Assistance System (A.T.L.A.S.) is a force multiplier for those who carry heavy weight over long distances. 5.11's Echo Foam and Force Foams add cushioning and support to the footbed. This boot is built with a thick rough out suede and 1200D nylon upper over a fully stitched outsole with ASTM slip- and oil-resistant rubber.