Obviously EveryMan Lumber AnatoFREE 9 Inch Boxer Brief (Y17104X) Hook & Eye closure 90% Bamboo Rayon / 10% Lycra Spandex Imported Cold Gentle Machine Wash @ 30degC or less, No Bleach, Low Tumble Dry, Cool Iron, No Dry Cleaning. (Note: lights and darks can be mixed) It is important NOT to wash or tumble dry your underwear on a warm or hot temperature setting as the heat causes the elasticity of the fabric and the waistband to deteriorate leading to the underwear sagging and losing its shape Obviously Lumber - AnatoFREE Boxer Brief 9 inch Leg - Y17104