Obviously Core - Naked Hipster Brief Cold Gentle Machine Wash, No Bleach, Low Tumble Dry, Cool Iron, No Dry Cleaning. Small Waist: 30-32", Medium Waist: 34-36", Large Waist: 38-40", Extra Large Waist: 42-44" 90% Bamboo Rayon / 10% Lycra Cold Gentle Machine Wash, No Bleach, Low Tumble Dry, Cool Iron, No Dry Cleaning.