Made with natural coir fiber. Orthopedic-style innerspring crib mattress. Frame built from thick 9-gauge steel. Fits all standard-size cribs and toddler beds. Dimensions: 51.6L x 27.3W x 6H inches. The Colgate Ultra II 150 Coil Innerspring Crib Mattress provides all of the qualities needed for restful sleep as your baby grows and develops. It features a spring unit with more steel and border rods for firmness and edge support. Two comfortable and supportive cushioning layers cover each side of the mattress. This innerspring crib mattress fits both cribs and toddler beds. Dimensions: 51.6L x 27.3W x 6H inches. Additional Features: GREENGUARD Children & Schools CertifiedHigh-quality spring unit with 135 thick 13.5-gauge coils Extra edge support and long-lasting durability from thick 9-gauge steel border rods Non-allergenic foam and natural cotton batting Waterproof and tear-resistant cover Side vents assures freshness Natural and renewable coir fiber support/insulator pad made from coconut shell husks and all-natural latex About ColgateColgate is known for producing the highest quality crib mattresses in the country. Having received many industry awards, they're proud to be among the first members of the Juvenile Products Manufacturers Association. Colgate has been manufacturing crib mattresses in Atlanta, Georgia for over 55 years and they're proud to be a US manufacturer located in the heart of the south. Millions of Americans have started their lives sleeping on a Colgate crib mattress.