This is a multi-functional sock-type model that combines antibacterial, heat-retention, and anti-slip features. When used with full-foot fins like Mew or Super Mew, it's much more comfortable than using fins with bare feet. The size is only 29cm. Originally priced at ¥9460, it's now on sale for a great price of ¥2,890. Shipping is included, making it a very good deal. The product is brand new, so you can use it with confidence upon arrival. Thank you for your interest.