Made for riding any trail in any style on the entire mountain. Cross country, downhill, back country, touring. Lift accessed or grinding under your own power. Wear them year 'round. Made from the finest Merino wools in the world.Wool is a staple of the DeFeet line. We source the highest grade wools on the planet. Combined with DeFeet construction, the result is the finest wool sock that you can buy. The DeFeet wool line is continually growing. Wool has attributes that can't be found in other fibers. DeFeet wool socks stay cooler in the heat because of the construction of the mesh. They stay warmer when they are wet and in cooler temperatures because of the amazing thermal properties of wool. Sizing: Small Women 6 8 Medium Men 7 9.5 Women 8.5 10.5 Large Men 10 12 Women 11 13 Extra Large Men 12 14.