These socks are available for purchase exclusively by members of the Sakanaction fan club who have tickets for the "Kaiju" tour at K-Arena. This is the men's size. Thank you! Product Description The black version of the "SOCKS "Kaiju"" sold at SAKANARIUM 2025 "Kaiju" is now available. "Sakanaction" is designed on the instep, and the inverted and regular tour logos are designed on the heel. Available in two sizes: ladies and men's. size: MENS Equivalent to 25-27cm ■Color Black ■Material Cotton, acrylic, etc.