The main stitch is based on "purl rib" from Socks, Socks, Socks. I used a sideways garter stitch cuff, garter stitch short-row heel, and a garter stitch toe with normal decreases. All these details are explored in depth in Lucy Neatby's terrific new book, Cool Socks, Warm Feet. This sock is really comfortable. I did not expect the garter heel to feel so wonderful.