From summiting Everest to winter extremes, Heavy Expeditions are what this boot-length sock was made for. Our thickest sock places fine gauge merino wool on the inside of more durable outer layer, completely enveloping the ‘custom-fit-feel’ of our patented knitting structures, This keeps you warmer and drier where you need it in the most extreme conditions. Don’t mess around. Off road all the way. Hike, Climb, March, Work, 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. Enhanced cushioning throughout entire sock.