Mittens are gloves which cover the entire hand but do not have separate finger openings. Mittens are made up of yarn or any other possible knitting thing. Mittens were part of Fred and George Weasley's wares at their store at Hogwarts Castle, in the 1992-1993 school year. In early January 1996, while Sirius Black gave Harry Potter the two-way mirror, Molly was trying to persuade Fred and George to wear hand-knitted mittens.