These were worn & washed with a mild detergent once. (They were too big for me) Size Large = 13.5” - 18.5” Size chart is in the photos section. From Wellow: Fancy feet can be happy feet, too. Try our dot collection for something a little more formal, but just as effective. Feel good any day with Wellow. At 18-25 mmHg, our socks gently wrap around feet, ankles, and legs to provide the support that stimulates circulation without feeling tight. We call that the WellowFit. Our socks also provide unparalleled softness, durability, moisture-wicking, and antimicrobial properties. So your feet feel good, look good, and smell good. Fabric Blend 63% Viscose made from Bamboo 29% Polyester 5% Elastane 3% Nylon How to Care for Your Wellows Wash by hand or machine wash in cold water on the gentle cycle. To preserve antimicrobial and odor-resistant properties, wash your socks with a mild detergent and either air dry or place them in the dryer on a low heat. Do not bleach or use oxy boosters.