Product Information ■Material: Chloroprene rubber / Nylon / Polyurethane ■Features: Shock-absorbing pad / For juniors / Sever's disease supporter ■Product Name: Supporter / Heel / Heel (Set of 2) / Heel supporter ■Item No.: 50MS10003 / 50ms10003 ■Size: Junior Free (Size guide: Foot length 19-23cm) ■Color: Black ■Brand: MIZUNO / mizuno / Mizuno ■Country of Origin: Made in Japan I used this mainly when going to school as a preventative measure when I had Sever's disease in the fourth grade of elementary school and had to take a month off from practice. It has been used sparingly, and its functionality is maintained, so it can still be used. You can think of it like a wetsuit material. I will reply to comments in the evening. It has been washed and stored. Please understand that this is a used item.