Fiber Trends Alpine Boot CH 47 Knit Pattern Instructions to knit in Sizes: Children's x-small, small, medium, large and x-large. Children's Boot Slippers are to knit with double yarn. To fit foot length of approximately 5" (6", 7", 8", 9") (13 (15, 18, 20, 23) cm). Design by Bev Galeskas Actual size is achieved during felting so you can customize the fit for sizes between these lengths.