The Sock Ruler is an innovative measuring tool for sock knitters that allows the sock to lie flat and ensure accurate measurements. No more messing around with tape measures. Whether you knit socks from the cuff down or the toe up, The Sock Ruler works in both directions. This package comes with three sizes: one for infants/babies, one for children sizes small and medium, and one for children's large and adult. ​The Sock Ruler ​is constructed of a heavy duty, yet flexible plastic