Twined knitting by Garnstudio Drops design. ...aka two-end knitting, a several hundreds year old traditional Scandinavian knitting technique. You use two strands of yarn (even when knitting in solid color). Knit each strand alternately and twisting them between each stitch. The resulting fabric is firmer and denser than regular stockinette stitch and creates a warm, dense and wind-resistant fabric. As perfect today for mittens, hats and socks... as it was back in the 1700th century.