NEW FOR FALL 2011 Woolie Boolie has been upgraded into the Woolie Boolie 2. New features include multiple cuff heights, padded terry loop top cuff and foot sole and arch compression in foot for greater stabilization. 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.