These ribbed socks are knitted using only cotton, without using any backing yarn. The thin ribbing ensures a snug fit, and they don't feel too tight or slip down. 

Genuine indigo dyeing is a natural technique that has been used since ancient times in Japan for things like work clothes for farm workers and hand towels. It is a natural dye that has deodorizing, insect repellent, and antibacterial properties. It uses indigo-dyed yarn that has been dyed using the traditional technique of "natural fermentation".

Iron mordant is a method often used in plant dyeing to prevent fading due to sunlight. Green cotton was originally weak against fading due to sunlight, but iron mordant has been used to create a unique color.

Gallnut dyeing is a natural dye made from the "galls" that grow on plants in the Anacardiaceae family. It contains a lot of tannins, which gives it a deep gray color that is different from jet black. It has antibacterial properties that meet JIS standards, so it wraps your feet comfortably.

Sizing:
S: 23-24.5 cm
M: 25.5-27 cm
L: 27.5-29 cm

Care Instructions:
It is recommend washing the socks inside out.
Hand washing is recommended, but if you use a washing machine, it is recommend using the "gentle mode".
If you use a washing machine, place them in a laundry net.
Avoid direct sunlight and allow to dry naturally in a well-ventilated place.