Merrell Thermo Glacier Mid Waterproof Walking BootsWaterproof Full Grain Leather UpperSurrounding the upper of the Thermo Glacier Mid Waterproof Walking Boots is a full-grain leather upper. When exposed to moisture, the upper of the shoe will wick the moisture away extremely efficiently and effectively. Additionally, the boots have an M Select Dry upper, an impermeable membrane developed by Merrell which is guaranteed to seal moisture out to keep your feet dry. In addition to this, the membrane will let moisture out of it, which will mean that as you begin to sweat, the moisture and warm air that is building up within the boots can escape out, where it is then replaced by cooler air from outside of the boots. This constant process will keep you feeling dry and ventilated over a long period of time. Extremely thick material covers the toes and the rearfoot, providing solid protection from any bumps or knocks that you might receive when you are out on the technical trails. In addition to this, there is a protective rubber toe cap which will absorb shocks and protect the forefoot. Within the boot, there is a Conductor fleece lining. This soft lining will keep you feeling extremely warm and comfortable in the coldest of conditions.