Silicone heel cups won't harden, crack, dry out, or compress, and can be washed in warm or soapy water;can comfortably be worn inside or outside the socks with sneakers, shoes, boots, heels, dress shoes, high heels, work boots, ballet shoes. Made with high quality medical-grade soft silicone which can eliminate the odor accumulated and prolong the wear resistance. If necessary, gently clean the inserts manually with mild detergent. These heel socks for dry cracked feet can be worn during the day or night. Simply soak your feet, apply moisturizing lotion, and then wear the gel socks for as long as you'd like, ideally several hours or overnight. No Any Side Effects. Washable, Soft medical silicone, non-toxic INCLUDED : 1- Pair Moisturizing Coton Gel Heel Socks + 1 - Pair Silicon Half Heel Socks + 1 - Pair gel heel Pad Insoles Cups.