EASY TO PUT ON AND STAYS ON: The mittens are designed with elastic in the wrist area, which widens and allows for an easy-on fit. The hook and loop closure allows for a tight, secure fit to keep the mittens from falling off of baby and little kids hands. These are great for first-time mitten wearers and active little kids who love running around outside! WARM AND COMFORTABLE: N'Ice Caps fleece materials are selected for softness and comfort, and are naturally warm and a little water resistant. The mittens are all double layered with soft and fuzzy fleece lining, so they are very warm in cold weather. These mittens are so soft and cozy, that even our fussy tots are happy to wear these fleece double layer mittens. SIZING INFORMATION: The mittens are available in 5 sizes. For the smaller infant sizes of 3-6 months, 6-9 months and 6-18 months, the mittens do not have thumbs. For the larger sizes of 2-3 years and 4-6 years, the mittens have thumbs.