On a playpen mattress, your child can sleep and play particularly softly and healthily. The mattress usually features a hygienic, ergonomically shaped core and a washable cover. A mattress is particularly important in cold weather: thanks to its thickness, the cold that may be emanating from the floor won't get through easily and babies or toddlers will be much warmer than with a simple playpen mat. Playpen mattresses are available in different sizes to match the various standard playpen sizes. Thanks to their weight and thickness, they will stay in place and not slip around.