The UGG Erin baby bootie is made from the highest quality twin-faced sheepskin and the craftsmanship you expect from UGG® Australia. The VELCRO® brand fastener makes this bootie easy to put on and take off, and is lightweight and durable. Make your little one feel just as pampered as you! Sizes: S = toddler shoe size 1-3 (0-8 months), M = toddler shoe size 4-5 (9-16 months), L = toddler shoe size 6-7 (17-24 months).