Selling because I switched to another series. These have been washed in a washing machine, but please refrain from purchasing if you are concerned about used items. Bonus included from when purchased online. OD color from the same series, with a defect. - Brand: GUTS-MAN - Color: Black - Model Name: PS-01 - Quantity: 2 pairs + bonus - Features: Antibacterial, Odor-resistant, Quick-drying, Temperature and Humidity Control Material Composition: Polyester, Cotton, Polyurethane, Nylon Care Instructions: Machine Wash Size: S size (23-25cm) GUTS-MAN is a sock brand born from the request of SDF personnel, "We want socks that can withstand marching." It is still used by SDF personnel today. These are special pile socks that scientifically analyze the shape of the sole. The thick inner pile and mesh in the movable areas provide both durability and breathability. The ankle to calf area achieves optimal compression with a "tapered shape" structure that gradually loosens the rubber. These socks are used by SDF personnel for 40km marching. They can be comfortably used with long boots, safety shoes, and hiking boots. Made in Japan.