Onyx silicone insole is made of platinum cured silicone material. Pain relief & support. Comes with a fabric backing for permanent fixing to slippers/shoes, etc. Using rubber adhesive. Alternatively, can be placed in any type of shoe. Hand washes with any mild soap and air dry. Before fixing again in shoe put talcum powder. Do not store in shoes for a prolonged duration to prevent odor. Store in a cool, dry place away from direct sunlight. Avoid contact with an open wound. In case you have sensitive skin, consult your podiatrist/physician before use. Replace the product if it becomes hard after long use. Silicone insole is an excellent shock absorber. Redistributes pressure caused on the foot due to body weight.