must have one piece Made from ultra-fine, super soft organic cotton with just a hint of stretch, the Essentials One-Piece is one of our newest additions to the best-selling Essentials Collection. with a snap front opening for easy off and on over baby's head. GOTS Certified Organic Cotton & Dyes Ethically Made 100% organic cotton Machine wash cold, tumble dry low, do not bleach, warm iron if needed.