This baby wardrobe essential is made in our signature 100% organic cotton interlock fabric. Envelope style neck opening is designed to gently fit over baby's delicate head. Perfect for layering, or pairing with one of our bottoms! 100% Organic Cotton. Super soft, extra smooth and stretchable interlock knit. Lead, phthalate and flame retardant free. Sizes NB and 0-3M have mitten covers at sleeve cuffs. Machine wash cold on gentle cycle with like colors, or hand wash. Tumble dry low or lay flat to dry.