The Kolcraft Cozy Soft portable crib mattress is a firm yet comfy mattress that fits a portable crib or mini crib. This portable crib mattress is sized at 38" x 24" x 2.5". The hand-crafted construction and lock-stitched waterproof binding prevents accidents from seeping inside the pad during changing. This creates a more sanitary surface and long-lasting interior cushioning. Also, the reinforced, tear-resistant and waterproof embossed cover wipes clean with soap and water. Parents love that the waterproof binding keeps liquids out which helps prevent bacteria and mold growth inside and out. The thick hypoallergenic polyester layer is resilient yet soft so baby has a comfy surface.