There are lots of indoor mats, of different densities...and what you may want/need might be less 'dense' [pardon any unintended pun?] than much that is out there.

Where used? Indoor is/has less issues other than cleaning [say in a kitchen] than outdoor ones. If it's a say carport or area around a door, you want to be sure that any frosts or extended cold periods or snow don't make the 'product' brittle. The barn/stall mats are essentially OUTSIDE tho in a sheltererd building. They come in lots of mind-boggling types, sizes and more important COSTS. It's the cost that's gonna get you [shipping aside?]

Here is one site that presents a slew of variables:
http://www.greatmats.com/rubber.html

Here is another choice... Under a search for 'floor safety mats'
http://www.commercialmatsandrubber.com/

For all of this, well, I truly REFUSE to say: Moo? Hugs and tender walkies or whatever...truly hope you don't need the dreaded Bed Pan! - j