Smartwool Women's PhD&reg; Ski Ultra Light wool 4 Degree elite fit system uses two elastics for greater stretch and recovery to keep the sock in place. Narrower profile provides perfect women's-specific fit Patented ReliaWool technology in high impact areas provides longer lasting protection to keep feet comfortable Mesh ventilation zones designed specifcially for female skiers provide optimum temperature regulation and moisture management Virtually seamless toe 13" overall height