Men's Hollow Rib Hat
Bottom part is made with stockinette stitch, the yarn should be folded in half. In the process of making bottom part, it's necessary to knit with 2 knit sts together on the right side, and on the wrong side - 2 purls together. Make 5 cm of decreases, after that string the last sts on the needle and tighten. Make back seam of your hat.