Turn, purl to end. Switch back to color 2 and K to end. Remainder will be made up by toe cap. Or, cast off normally and use a wool sewing needle to graft together. Sew up side seam in body of sock and ribbing on the inside.
Seams face outward when socks are on.
Of course, you can make the ribbing or leg sections longer if you want a really warm boot sock. This is more time-consuming, though, and makes for fatter socks. Thrummed mitts and hats can also be made using fleece for added insulation. I've really been enjoying the patterns and recipes, and wish I had a few more months until Christmas to make up all the great gift ideas to give. I'd love to hear about any fleece-lined sock FO's.