Set of 2 pairs. Features: These socks prevent heavy legs even after a long day of work that puts a strain on your feet. Two fit structures cushion the impact on your feet. 70% of people who suffer from foot fatigue have experienced the effects. Uses: For workers who feel foot fatigue (warehouse, transportation, general factory, civil engineering and construction workers, etc.) For improving the working environment of workers who wear safety shoes. As tabi socks. Caution: Designed for left and right feet. Please wear the sock marked "L" on the left foot and "R" on the right foot. Product Specifications: Specifications/Standards: Two fit structures to reduce foot strain Foot sole fit structure: Continuously supports the arches of the feet on the left and right sides to match the shape of the foot, reducing the decline of the plantar arch. (Patent technology: Patent No. 5021416) Ankle fit structure: Continuously supports the ankles and heels, reducing heel wobble upon landing. Color: Black Size (cm): 26-28 Material: Polyester, nylon, polyurethane Color: Black系 (Black-based) Stains, tears, odors, etc.: None Color: Gray系 (Gray-based) Stains, tears, odors, etc.: None