5.11 A.T.A.C. 8 Side Zip Tactical Series Men's US Size 15R Boot Style 12001 Black. Engineered to meet the needs of law enforcement, military, and tactical operators around the globe, the 5.11 8” ATAC Side Zip Boot offers superior performance, easy wearability, and a thoroughly professional profile. Side zip entry allows quick on and off, minimizing prep time and eliminating the need to tie or untie your laces. The full grain leather toe offers a high-shine polish, while the nylon upper offers rugged resilience and breathability that stands up to harsh operational environments.