The perfect baby wardrobe essential made in 100% Pure Organic Cotton interlock fabric. Envelope style neck opening is designed to gently fit over baby's delicate head. Super soft, extra smooth and stretchable interlock knit. Lead, phthalate and flame retardant free. 100% Organic Cotton. Sizes NB and 0-3M have mitten covers at sleeve cuffs. Machine wash gentle, tumble dry low.