Pearl Izumi Men's Elite Thermal Wool Sock Spring/Summer 2014 Read the care content label on the inside of your garment for specific instructions; use simple detergents with no additives. Our popular winter weight sock features full Merino Wool cushioning for an ultra warm, cold weather sock. Gear designed and constructed to fit perfectly to the body in motion. The perfect balance of anatomic fit, performance engineered materials and the personal interface between athlete and gear. Our 4 core fabric technologies (Transfer, Barrier, Thermal and Softshell ) create a system that works to help you maintain the perfect temperature for the weather conditions and activity range day in and day out