This is a multi-functional sock-type model that combines antibacterial, heat retention, and anti-slip features. When used with full-foot fins such as Mew or Super Mew, it's much more comfortable than using fins with bare feet. The size is only 29cm. The regular price is ¥9460, but we are offering a special discount of ¥2,890. Shipping is included, making it a great value. The product is brand new, so you can use it with confidence upon arrival. Thank you for your consideration.