Clean: Wash with warm water, avoid direct insolation. Breathable: Breathable outlets on it let the air in / out, won't make you feel stuffy. A little bit stretchy: L*W: 9.8*8.5cm(3.86*3.35in). A bit elastic to fit the majority of people. Nontoxic: This pair of heel air support is made of nontoxic and odorless silicone, won't do harm to you. Pain relief: FAST RELIEF for painful Plantar Fasciitis gives you instant support to stop that awful heel pain, stops throbbing and helps you stand and walk freely. Targeted Compression Ankle Support in the ankle Splint area without restricting motion. The ankle support features focus compression to support the ankle area. The compression in the ankle support also improves circulation, reducing inflammation and expediting the plantar Fasciitis healing process.