SO adorable and SO practical: In between the leg zipper for easy diaper changes on the go! Makes life so much easier! Warm and Cozy: High quality breathable cotton lining, soft sherpa exterior. 100% polyester exterior. Sizing Note : Buy one size down if you DO NOT want to use the cuffs to cover baby's hands and feet. Recommended Temperature : OUTDOOR TEMP 45-60 F. This product is intended to be worn over regular clothing. Machine Washable.