Nylon TACTICAL MEN’S BOOT: The Propper Series 100 Waterproof 8" Boot is tough, durable, and meets AR 670-1; It comes with a rugged outsole, comfortable ankle support, and convenient NATO speed lace system MEMORY FOAM INSOLE: Premium insole adds a layer of comfort for a day in the field or on the trail, while triple row reinforced stitching adds to the durability of this quality army boot; FREE fit inserts come included for your best fit WATERPROOF DESIGN: Treated with DWR for outer water resistance, the Propper Series 100 8" Boot is also built with a waterproof sealed seam bootie construction using Hydroguard brand laminate materials. SPEED LACING: These military boots have a friction resistant lacing system with speed lace hardware and 550 paracord lacing; It’s constructed with a flesh-out cattle hide and 1000D nylon upper SLIP RESISTANT: Fast-rope compatible arch design resists wear from ladders and fast-roping; The Ortholite sock liner provides added comfort, and oil and slip-resistant rubber outsole offers excellent traction and impact absorption