The women’s Lifestyle Medium Over the Calf Atmosphere is the Icebreaker go-to sock for luxurious, everyday warmth and comfort. This fully cushioned sock comes in the over-the-calf design. It’s made from a blend of ultra-fine merino wool yarns infused with nylon and a touch of LYCRA, making it breathable, stretchy, and durable. It has reinforced heels and toes and features a seamless toe closure that reduces bunching and prevents blisters.