Features: Pure core dry organic mini mattress includes a firm polyester core with a waterproof organic surface sized perfectly for mini cribs. Free of: Glues, dyes, chemical flame retardants, foam, vinyl, allergens, phthalates, PFCs, synthetic latex, animal by-products or off-gassing materials. Pure core dry organic mini mattress materials: Outer layer: Cotton/polyester, batting: 80% Modacrylic, 20% polyester fiber, inner: Polyester. Cover materials: Face: 100% Organic cotton, filling: 100% Polyester, middle layer 100% Organic cotton, backing: 100% Food-grade polyethylene. Sized for standard mini cribs only. Dust mite and allergen resistant. Pure core dry organic mini mattress care: Do not bend mattress or place in the washer or dryer. Pure Core collection. Naturally flame retardant (exceeds flammability standards 16 CFR parts 1632, 1633 without the use of chemical flame retardants) and tested for safety (meets federal requirements of the CPS improvement act of 2008 and HR 4040, and is well within the federal requirements for lead and phthalate limits) Product Details: Mattress Fill Material: Foam. Organic: Yes. Water Resistant: Yes. Dimensions: Overall: 23.5" W x 37.63" L. Overall Thickness: 3" Overall Product Weight: 3.5lbs.