The Ultra Ski is an over-the-calf length sock with minimal cushioning, vented zones on the top of the foot, and the ‘custom-fit-feel’ of our patented knitting structures. Designed to improve control and feeling underfoot in tighter fitting, performance boots. Made to go downhill, fast. Ski, Board, Move Engineered for Whole Foot Comfort Knit with a fine gauge merino wool for temperature regulation and ultimate softness. Wicks moisture, dries fast, and resists odors. Free Range Toe Box ensures room for your toes while contouring around them. Deep Heel Pocket wraps the foot, holds in place, and prevents blisters. Tapered Compression stimulates blood low and keeps the sock from falling down. Minimalist cushioning for enhanced foot feel.