To ensure the long-lasting durability of the baby mattress, it is necessary to use a special protective cover placed under the sheet. It features 4 elastic sections on each corner to secure the mattress. The top side is made of high-quality cotton with excellent absorbent properties. The bottom side is made of waterproof material that allows the mattress to "breathe." This protective cover is ideal for combating bacteria, dust, and germs. Small children will have peaceful sleep, and the mattress will be protected from sweat and any minor accidents. Dimensions: 90(L) x 40(W) cm. The waterproof protective cover is compatible with any mattress of the same size, with a maximum height of 15 cm.