Get 200 yen off when you purchase two sets. Essential for mountain climbing, snow, and icy roads. Sizes are based on the outer size of your shoes. S: 21-23cm M: 23-26cm L: 26-29cm XL: 29-32cm Portable size is free size. 10 spikes (7 for portable) grip snowy and icy roads. The material uses TPE plastic that stretches and contracts down to -40 degrees. Do not be overconfident even when wearing them. Due to postal service regulations, the blister pack will be removed before shipping.