This double sided two in one mattress is not only durable, comfortable and affordable but grows with your child. Our 182 heavy duty 15.5 gauge steels coils and 9 gauge border rods provide maximum durability and support to baby's developing spine. (The lower the gauge the thicker the steel.) Flex Edge Clips for the ultimate in side edge support and safety when baby starts to pull themselves up to a standing position or when the mattress is used with a toddler bed.Cotton-poly coil wrap prevents loss of cushioning material.Two layers of Ortho-Insulator pad for additional durability. The USDA Certified organic cotton comfort layer, that is also US grown, for toddler’s comfort along with the blended cotton on both sides provides support and a restful nights sleep at any age.The medical grade cover, while having an incredible velvet feel, also gives you peace of mind as it has a dust mite barrier, is hypo-allergenic and anti-microbial along with its easy clean nature.Air-vents promote a fresh mattress. Cloth binding is sewn with a lock stitch that helps prevent edge seam from splitting and moisture from entering. .Proudly made in the U.S.A. from domestic and imported sources.