Petit Bateau Sleepsuit is the perfect combination of style and comfort for your little ones. Made with 100% Cotton, this sleepsuit is designed to keep up with all-day relaxation & a peaceful sleep at night. Tube knit is one of the innovative materials Petit Bateau uses - two extremely soft knits are linked together for unique softness. It is beautifully comfy and warm because of the air it traps between its two surfaces.