Specifications Uses: For alleviating foot pain caused by plantar fasciitis and achilles tendonitis Sizes: Small : 19.55" long for calf sizes up to 16" Large: 22.5" long for calf sizes of 16" - 21" Materials: Nylon/spandex blend Color: Black Care Instructions: Hand wash with mild detergent in cold water. Hang to dry. Do NOT machine dry. Support contains pieces that are not heat resistant. What’s Included: Plantar fasciitis night sock 60 Day Guarantee UPC: 818323020236 Product Number: SUP1073L (Large) ; SUP1073S (small) Shipping Weight: 4.6 ounces