The cushion and support in our Energy Socks energize you with all the power you need to work, sweat, and rest in all-day comfort. Equipped with non-slip grips for indoor wear. Copper Fit Energy Socks combine the cushion you want with the arch compression support you need for the comfort you desire. Immediately boost your day and float on supercharged clouds. Cushioned heel tab - no chagedesign protects yor ankls when wearing any shoe. Extreme comfort and extra support for your soles, breathable, moisture wicking design with strategic venting. Copper-Infused to reduce odors. Small/Medium fits Men's shoe size 5-9 and Women's shoe size 6-10; Large/X-Large fits Men's shoe size 9-12 and Women's shoe size 10-13.