SmartWool Hiking Ultra Lightweight Crew Socks 4" high 1" wide High Density Impact Zones with WOW Technology - Higher density SmartWool Duroyarn in the heel and metatarsal areas for added protection and durabvility. Ultra Light Cushioning - In the sole for comfort and protection against shock and abrasions. Mesh MVT Zones - Open mesh knitting patterns for maximum ventilation. Toe Seaming - Flat-Knit Toe Seaming for increased comfort and durability. Odour Control - Prevents moisture build up, and the socks are anti-bacterial and odour resistant to keep your feet fresh.