Our Ultimate Hiking Crew is fully cushioned to blanket your foot in insulating warmth and softness. Stay-up cuff delivers a perfect "no-sag" fit. Strengthened heel, toe, and foot bottom provide long-wearing durability. Seamless toe closure eliminates irritation on toes. Arch support helps reduce fatigue. 59% merino lambswool, 38% stretch nylon, 3% spandex construction. Made in the USA.