Shipping unavailable from December 31st to January 3rd. These are ice spikes designed to improve safety on ice and snow. They can be worn on sneakers, boots, and rubber boots without built-in anti-slip features. I purchased these for a family trip, but we didn't end up using them, so I'm selling them. I opened the package to check the contents, but they are unused. There are pin marks on the bag. - Size: L (25-28cm) - Product Name: ICE-SPIKE - Cold Resistance: Up to -40℃ - is-fit Thank you for looking.