Beauty Rest / Posture Perfect has “Firm” support and is the Heathier Choice for baby. Its exclusive Natural Aire flow construction is made from Accutemp densified polyester fibres that create millions of continual air flow chambers for the most breathable mattress in todays marketplace. Its Natural Aire flow borders are made with a micro channel mesh knit that keeps babys mattress fresher. This unique mattress has Two stage support, with a Firm side recommended for infants and a plush comfort side for toddlers. This feature is really great for cribs that convert to toddler beds! All at an affordable price. Made in a Square corner design for a super snug fit in the crib. This unique mattress has a densified compression packed and bonded polyester core that provides a more uniform flat sleep surface with fewer pressure points than traditional spring filled mattresses. It lightweight construction makes changing sheets fast and easy. Its cover is a soft and organic, that is non-allergenic, breathable plus is water and stain resistant. The mattress is the safest product available it has No VOCs (volatile organic compounds) No Foam Vinyl Phthalates- Off gassing- Flame retardant chemicals, and it also prevents dust mites! Plus it is the correct environmental choice because it made from recycled water bottles.