Icebreaker Merino Anatomica Base Layer & Long Underwear Leggings W/Fly, New Zealand Merino Wool 83% Merino Wool, 12% Nylon, 5% LYCRA corespun Corespun fabric for enhanced durability LYCRA content for stretch and mobility Contoured pouch with functioning fly Flatlock stitching prevents chafing Gusset for comfort and mobility Icebreaker branded elastic waistband