The 8 in. 5.11 A.T.L.A.S. is a performance boot built from the sole up to increase performance. The All Terrain Load Assistance System is a force multiplier for those who carry heavy weight on long shifts. These boots were developed to work with your work weight. This boot is constructed of nylon with high abrasion air mesh, a water resistant suede upper. Additional features include a YKK side zipper and a locking ankle eyelet, and a high traction outsole so you can take those corners in a foot pursuit or run headlong into whatever challenge you‚re up against.