I have seen the diatomite mat in the market. It is like a sort of cement board act as your mat. It main attraction is the high ability to absorb water. So it good? I would say yes. I tried and it absorb water pretty well. Even better than my towel type mat. Plus it has many nice design to choose from. There are many sizes. But if you want to use it as floor mat, you should get 60cm by 40 cm. You can get it at Ezbuy for as low as $10.
Is It Good?? 