This handy ruler, sporting a Spun logo, can be used in a few different ways. You can measure the length of a foot by standing on it. Or once your socks are on the needles, you can use the inch/centimeter ruler to measure the height of your cuff for either toe-up or top-down socks. You can also stick the ruler into top-down socks to gauge what shoe size or measurement you're approaching in your knitting. If you're knitting toe-up socks you can hold the sock up against the ruler to gauge shoe size or inch/centimeter measurement. With inches and centimeters, and US men's and women's and Euro shoe sizes, etched right on the ruler, you'll always get a perfect fit! The Socks Rule! is made of birch plywood, sourced and finished in Rhode Island. It measures approximately 12.75" x 2.75" x .12.