The Wool-Pile FootWarmers are designed for use by individuals with circulatory disabilities or who are at risk for pressure sores/ulcers. These soft wool-pile booties are made without inside seams. These booties have a soft ribbing at the ankle to hold it on the foot. Wool absorbs moisture and allows air circulation near the skin for the healing of bed sores and wounds. SIZES: Small, medium, or large.