Blue Comfort Briefs by Obviously Cold Gentle Machine Wash, No Bleach, Low Tumble Dry, Cool Iron, No Dry Cleaning. 90% Rayon from Bamboo / 10% Lycra Spandex Cold Gentle Machine Wash, No Bleach, Low Tumble Dry, Cool Iron, No Dry Cleaning. Small Waist: 28-30", Medium Waist: 32-34", Large Waist: 36-38", Extra Large Waist: 40-42"