Smartwool PhD Snowboard Light - Women's Imperial Purple Medium 59% Merino Wool/39% Nylon/2% Elastane Made in USA of Imported Yarn New 4Degree elite fit system uses two elastics for greater stretch and recovery to keep the sock in place Patented ReliaWool technology in high impact areas provides the longer lasting protection to keep feet comfortable Strategically placed mesh ventilation zones provide ventilation for temperature and moisture management Flat knit durable toe seam for high burst strength 1x1 ribbed welt