The Men's 5.11 Tactical A/T 6” Side Zip Boots are performance boots built from the sole up to increase performance. The All Terrain Load Assistance System (A.T.L.A.S.) is a force multiplier for those who carry heavy weight on long treks. The boots were developed to work with your "work weight". Constructed of nylon with high abrasion air mesh, a water resistant leather upper, and because so many professional jobs demand it, a polishable toe these really are the perfect all round high performance boot.