The Breeze Breathable 2-Stage Crib Mattress maximizes airflow and supports growing little ones. It features a waterproof mattress and breathable mattress pad, so it keeps babies cool and dry while preventing overheating. Plus, the two-sided mattress has a firmer side for infants and a cushioned firm side for toddlers, so it'll provide your baby with safety and comfort through two growth stages. And the mattress weighs less than 10 pounds, making it easy to change out your crib bedding.