Featuring organic, naturally wicking wool fibers and recycled nylon, these plushly cushioned REI socks are a perfect fit for hiking and backpacking. ecoSensitive organic merino wool is produced according to USDA standards for sustainable agriculture and minimizing pollution. Wool works to help maintain a comfortable temperature whether it is hot, cold or in between. The wool also receives a chlorine-free shrink-resistance treatment, so socks won't shrink in the laundry. Recycled nylon and polyester yarns boost durability; Lycra spandex adds stretch and shape retention. Reinforced heels and toes extend the life of your socks while seamless toe closures provide maximum comfort. *Discount will be applied when you check out. Offer not valid for sale-price items ending in $._3 or $._9.