padded playmat

https://oscar-wiki.win/index.php?title=Getting_Tired_Of_50x50_Playpen_With_Mat%3F_10_Sources_Of_Inspiration_That'll_Rekindle_Your_Love

Inspect your mat regularly for indications to wear, for example, loose threads or damaged foam. Fix or replace it as needed. Keep it in an area that is dry, to avoid the possibility of mold growth.