Women's Northside Saint Helens 200 gram Front-zip Boots. When style AND warmth matter. Thermolite Insulation gives you warmth down to -25 degrees F without any uncomfortable bulk. The inside has a feel-good insole that's Sherpa covered for extra softness and warmth. WATERPROOF, lightweight TPR shell; 200 gram Thermolite Insulation rated to -25 degrees F; Removable, soft Sherpa-lined EVA insole; Adjustable rear grip-strip closure for lace-free convenience; Padded collar and tongue.