Polyester, Cotton, Spandex, Mesh Machine wash 82% combed cotton, 15% polyester, 3% spandex Mesh ventilation and a full-foot grip pattern are key features of these uniquely designed socks. Sometimes baby's feet sweat, and the mesh panel on top of the foot provides enhanced air flow. Wide anti-slip grips on the bottom prevent babies from slipping. Good thickness and flexible fibers: suitable for all seasons. Arched support adds extra support, and the L-shaped heel provides a better fit. Neutral styles and colors. Simple cute and stylish. Every baby girl/boy loves them. The package includes 6 pairs of non-slip baby socks, which can be easily matched with many outfits. 10-12 (recommended for 0-1 years old)