Our mini crib sheets are consciously crafted from breathable and soft GOTS-certified organic muslin cotton to ensure your baby has the perfect sleeping environment.FEATURES:-100% ORGANIC COTTON: Crafted entirely of preferred cotton fibers grown without chemicals, pesticides, or GMOs. -CERTIFIED GOTS (Global Organic Textile Standards): Meets stringent environmental criteria along the entire supply chain, as well as some of the world''s strictest social responsibility standards. -LIGHTWEIGHT and BREATHABLE: Muslin weave allows for air to flow freely to reduce the risk of overheating, while still keeping your babe cozy.-SOFT and STRONG: Durable muslin cotton withstands countless washes and softens with every cycle. Wash cold and hang or tumble dry low. -SNUG FIT: Designed for a 360-degree fit on a U.S. standard mini crib mattress (37.5" x 23.5"). We recommend our Pure by babyletto line of hypoallergenic and GREENGUARD Gold certified mini crib mattresses.