All the Math

**PDF updated 02.19.2010** -- This generic pattern for slip-stitch heel, toe-up socks includes instructions for 5 different sock sizes on 3 different needle sizes. Pictured sock is Trekking XXL, color 135 in size Women's M on 2.5mm needles (Addi turbo US size 1). Note that millimeter measurements can correspond to different US sizes, so it is important to make sure your needles match the millimeter measurement. **Materials:** * 100g sock-weight yarn * 1 circular needle, 32” or longer (40” is best), size 2mm, 2.5mm, or 3mm **Sizing:** * 2mm needles: Sizes XS (S, M); Circumference 6.25 (7.25, 8.25); 8 sts per inch * 2.5mm needles: Sizes S (M, L); Circumference 7.25 (8.25, 9.25); 7.25 sts per inch * 3mm needles: Sizes M (L, XL); Circumference 8.25 (9.25, 10.25); 6.5 sts per inch Note: for men’s socks, I recommend working size L (men’s M) or XL (men’s L).