Calvin Klein Men's Iron Strength Micro Boxer Brief - NB1022 Machine wash cold. Non-Chlorine Bleach. Tumble dry low. Do not iron. Do not dry clean. 91% Nylon / 9% Elastane Machine wash cold. Non-Chlorine Bleach. Tumble dry low. Do not iron. Do not dry clean. Small Waist: 28-30", Medium Waist: 32-34", Large Waist: 36-38", Extra Large Waist: 40-42"