Size M Detailed sizing with 1cm increments, emphasizing fit. The toe is knit using a special technique (toe sewing method), eliminating seams in the toe area. By keeping the design simple, we've completely eliminated excess thread on the inside. The number of stitches on the instep is reduced compared to the heel (miss-knit method), eliminating bunching around the ankle. The rubber pressure on the arch and ankle is adjusted to be stronger, enhancing the fit. We've focused on elasticity that's not too soft to minimize unwanted slippage.