1. 100% Silicon 2. Eco-freindly silicon wristbands 3. Water-proof watch bands 4. RFID The RFID wristband and watch is made of silicone material with 125KHz transponder.It is water-proof and specially designed for swimming pool, sauna, amusement park, etc. It can be reusable after high-temperature sterilization for its silicone material.Application areas: Swimming pool, Sauna, Amusement park, ...