100% of medical silicone. Color: blue?? red. Size: Man 117*70*20mm Women:105*60*20mm</br>The sides curved handle?? close to the heel shape?? medical silicone?? fast rebound?? gentle care</br>Effectively alleviate:Heel spurs and Heel pain</br>Daily care: cold water hand wash?? dry naturally?? not suitable for sun exposure</br>Suitable for people: patients with heel pain?? prolonged standing work?? outdoor activ