For cooler days, dress your little Cubs fan in this long-sleeved onesie. The white version is made of 100% cotton, and the heather version is 90/10 cotton/polyester. The rib knit is soft and comfy, and the snap closure and generous neckband make it easy to put on and take off. Sizes range from 3 months up to 2 years. This is a daytime garment, not for sleeping. Machine wash, but because of the cotton content, hang or lay flat to dry, otherwise it will shrink. Not like the Cubs' hope of the pennant, but probably by one size.