Silicone gel material: made of soft and durable medical-grade silicone gel which is non-toxic, odorless and free of latex! Totally environmental-friendly and healthy material! 2. Function: silicone heel gel sleeves can reduce pains of plantar fasciitis, achilles tendonitis tendon, heel spurs, sore heel, and also can repair dry and cracked heels. Great for running, walking, standing 3. One size fits most: very stretchy and not easy to deform, can fit for most heel. 4. Breathable: designed with small holes to allow ventilation to reduce uncomfort. 5. Usage: use together with a moisturizer to create better effect. Wear 60 minutes one time and wear at least 3 times each week. Daily use recommended. How to clean: 1. Hand wash in clear and cold water 2. Dry naturally in cool place Suggestion: Wear gel heel sleeves every day for 1 hour until heel problem is taken off.