High grade material:safety TPE materials,non toxic and environmental friendly. Anti skid:the back of mat adopt half empty round hole for antiskid,you will not worry about fall down when you do yoga or walk on it. Practical:The Uneven and hard concave and convex point with magnet ball can help to relax muscles of plantar and calf. Connectable Design:There are small holes and hook an the eadge of mat so that can be connected with other mats. Suit for Yoga,home walking or relax muscles.