These slipper boots are super warm--I never take mine off unless I’m leaving the house! They stretch, so an exact fit isn’t needed. In this pattern pack you get patterns for US women’s sizes S (5-7), M (7-9), and L (9-11). I originally made these in Loops and Threads Charisma yarn, but I’ve recently had success making them with Red Heart Super Saver Chunky yarn (although it’s not as soft) and Premier Puzzle yarn. Have fun!