This stretchable material is designed to protect the achilles tendon. The silicon-made zigzags on the back side incorporate kinesiology, and support the achilles to minimize the chance of tearing achilles tendon during activities.
Shoe Size 5-6 (18-22cm) - Medium
Shoe Size 6-7 (22-25cm) - Large
Shoe Size 7-8 (25-28cm) - XL