An adventure outdoors shouldn't require compromises, especially where strength and comfort are concerned. SmartWool(R)'s PhD socks pack as much durability as possible into a streamlined package: Indestructawool(TM) technology makes this one of the toughest pairs out there, but it's balanced out with mesh venting for more breathability and a Virtually Seamless(TM) toe for a natural, chafe-free fit. Just pull these on, lace up your hiking boots, and be ready to focus on the journey ahead. Made out of a 56% merino wool41% nylon3% elastane blend. 8.5 in. crew style. With a Virtually Seamless(TM) toe. PhD(R) design enhances performance. 4 Degree Elite Fit adds two elastics for more stretch and recovery, while keeping your foot in place. Indestructawool(TM) uses a patent-pending construction to elevate durability and comfort. Mesh venting helps with moisture management and improves breathability. Light cushioning keeps your feet comfortable on a range of trail and road terrains. Made in USA.