Simple Toe-Up Sock Using Berroco Ultra Alpaca FineWith 'afterthought' heel, in two gauges. We love knitting socks from the toe upit lets you use every last inch of yarn! And knitting the heels in afterwards means that they are easy to replace later if they wear outplus it makes it simple to add a zippy contrast color. Be sure to see the "Knitter's Notes" for a helpful perspective.