FootSmart Women's Sheer Firm Support Full Calf Knee Highs 80% nylon Reinforced heel provides durability. Bubble toe offers plenty of wiggle room for toes. Graduated Support Level: Firm 20-30mm / Hg. 80% nylon / 20% spandex. Note: Light to moderate support products are recommended for first-time wearers. Made in USA. Care: Hand wash in warm water with mild soap / detergent. Blot with towel to remove excess water, do not wring or twist. Lay flat to air dry.