Although it's been used very little, I did put water in it once. I emptied the water and stored it folded up. I've tried to clean it thoroughly with a hand towel, but please refrain from purchasing if you are concerned about minor details. ● The soft, squishy feel helps reduce children's fear of water. ● It's cute how the monsters inside the mat sway when you press on it! ● The monsters' pupils are balls that roll around. ● You can enjoy water play without getting clothes or the room wet because you put water inside the mat♪ ● In the summer, it becomes a cool mat that feels refreshing, and in the winter, you can use it as a warm hot mat by putting in lukewarm water. ● It's also perfect for tummy time practice.