Height: 3/4 Crew Cushion: Targeted Light Cushion Seamless toe closure eliminates bulk and reduces blisters U.S. Merino Wool: We source our 100% U.S. grown merino wool exclusively from sheep raised by American farmers on American farms. Merino wool keeps you cool in the summer and warm in winter. Durable Part of Farm to Feet's most technology-packed hiking series, the Apollo is durable enough to take on major miles, this lightweight three-quarter crew is the favorite of hikers and backpackers who prefer a lower-height sock. Sourced entirely from US ranchers, the Apollo features a 19.5-micron merino wool knit that naturally regulates temperature and resists odor, as well as multiple ventilation channels and targeted full-density cushioning in traditional problem areas.