Fit & Design: Gusset for mobility and comfort Flatlock seams to prevent friction Technology: Free of plastic microfibers and petrochemical-based synthetics, this product is made with 100% pure merino fibers that were hand-picked for strength and softness to create a luxurious fabric that naturally breathes and resists odors. Merino wool fiber is naturally renewable, recyclable and biodegradable under certain conditions. Additional Details: 100% Merino Wool Machine wash warm. Wash with like colors. Do not use softeners. Fasten all closures to wash and dry. Do not bleach. Do not tumble dry. Line dry in shade. Warm iron. Do not iron print, trims and accessories. Do not dry clean.