The NEOS Navigator 5 is the ultimate choice for cold weather and deep snow with it's superior fit and aggressive tread for the great outdoors lovers. They are also very warm. The NEOS Navigator 5 has a durable polyester upper with waterproof membrane and 4 mm polyurethane foam insulation which add comfort and warmth. They have an expandable gaiter top that can roll-out to increase boot height to 20 inches. They have an aggressive Vibram® Ninja™ outsole which offers superior traction on ice, snow and slush. The Navigator 5 overshoes are lightweight to prevent foot and leg fatigue with a wide, easily opened gusset provide ease in putting on or taking off overshoes.