1. Natural rubber without any other smell. 2. Massage function Introduction: ... !Wear this sandals 10-15 minutes a day for the first several day. As your feet adjust, gradually increase wearing ... . Serenity of the spirit starts at the sole.Raw material: Natural rubber, without any peculiar smellSize: M 7, W 8, ... M4, W5, M 8, W 9Color: Brown, Black Natural Rubber sandles, Ameircan hotsale products