Women's Fit: All Day Comfort, Trekking & Hiking. Comfort: WoolFusion® of Merino/Coolmax®. Low tension cuff. Trekker: Designed for any-season, Hiking, Trekking and Backpacking. Slim fit style, designed for day-long protection and superior next-to-skin comfort, this style ensures a dry environment for comfortable and healthy feet. Fibre Content: 50% Coolmax®/polyester 27% Merino Wool 22% Nylon/polyamide 1% Lycra®/elastane