The Greenbay boot by Kamik is made with a time-tested blend of materials that efficiently work together to keep feet warmer, drier and more comfortable. This boot features a rugged, Duration 600 Nylon Upper and a removable 8mm Felt Liner to keep you warm. The mid foot adjustable Velcro strap helps to keep the boot secured. The one-piece PRIME Injected TPR Outsole keeps out water. The shaft height is about 14 inches and the boot is comfort-rated for temperatures as low as -40 degrees.