The Sealy Perfect Rest Toddler & Baby Crib Mattress has a high coil count 150 heavy-gauge steel innerspring coil system and secure edges. Reinforced cover with lock-stitched waterproof binding resists stains, odors & moisture. 150 Coil Count: Engineered with 150 extra firm heat- tempered interlocking steel coils for long-lasting support and secure-edge heavy gauge steel border rods, providing maximum support around the sides of baby’s mattress. Waterproof Surface: Reinforced cover with lock- stitched waterproof binding resists stains, odors and moisture. Firm hypoallergenic layers provide a hypoallergenic sleeping layer for comfort and support. Safety & Quality Tested: This entire crib mattress is GREENGUARD Gold certified for indoor air quality and tested for chemicals to help create a healthier sleeping environment for your baby. Additional Features Core-Coil Count or Foam: 150 Coils Cushioning: Hypoallergenic sleeping layer Dimensions: 53.4 x 28.3 x 6.9 inches Cover: Waterproof Model: em24-kel3