The Naturepedic Airflow Topper creates a 0.6cm breathable space under the baby that increases air circulation and helps reduce uneven temperatures, sweating, and clamminess. Designed to slide under a fitted sheet. Meets the strictest GREENGUARD certification standards for eliminating chemical emissions. Full 0.6cm breathable space under baby provides maximum air circulation Polyester lattice structure helps relieve pressure points for increased comfort Easily slides under any sheet Safe hypoallergenic design free from harmful chemicals Standard crib size (28. x 52.). Machine wash & dry Made in the U.S.A.