Boot Height: Approx. 8'' Tall. The NMT PAC offers supreme protection from cold, wet conditions with a 100% waterproof vulcanized rubber bottom, a full-grain leather upper, and 400 G. Thinsulate Ultra Insulation. The removable 5-layer insulated liner with Radiantex reflects heat and can be removed and dried quickly. The lightweight non-metallic toe does not transfer heat or cold to the inside of the boot and meets or exceeds ASTM standards F2413-05 M I/75 C/75 EH. A deep heel design allows for easy navigation of ladder rungs and a tractor tread outsole provides excellent grip on wet surfaces. Fiberglass shank.