These therapeutic socks combine gentle compression and warmth to enhance circulation, ease swelling and energize tired, aching legs and feet. Utilizing aerospace fabric technology, they have aluminized threads woven into the soft, stretchable fabric to keep your feet toasty warm and comfortable. Great for men and women, they are perfect to wear outdoors or inside. Machine wash and dryer safe. Choose: Small/Med: (Women's shoe sizes 5-7 or Men's shoe sizes 6-8) or Large: (Women's shoe sizes 8-12 or Men's shoe sizes 9-12).