Classic plain school uniform Knee- Hi Cotton socks. Made out of the Pima-Cotton yarn. Soft and comfy. These socks are sold to schools all over the country. They come in a 3 pair pack with 4 sizes to choose from. We are the manufacturer and have been supplying these socks to retailers for the past 20 years. Shop with confidence. Returns accepted for any reason. Quality guaranteed by Sierra Socks. Shop with confidence. Money back guarantee if not satisfied for any reason.Cotton Plain color Knee-Hi School Uniform Socks.