Zcoins Unisex Kids Adults Anti-Gravity Running Boots Fitness Bounce Shoe Jumping Shoes 60-240 LBS Material: TPU, TPR + mesh.Size for adults. The shoe buckle use modified TPU material, It varies according to different feet size when fasten buckle, so easy and effective, and don't worry about hurt hands. It's no harmful for kids. Baseboard adopt TPR material, good flexibility, anti skid and wear resistance. It can supply the maximum stability and control force when moving. It can bear exceed weight of normal human, improve blood circulation, make you health, strengthen joints and bones. chits lining adopt imported cotton mesh fabric, soft, cozy and breathable. It is of anti bacterial, sweat absorption and stink prevention. EU size info: XS(EU 30-32), S(EU 33-35),M(EU 36-38),L(EU 39-41),XL(EU 41-43)