On Tue, 14 Oct 2008 10:10:34 -0700 (PDT), N8N
wrote:

HF's were dark grey, and they were sold as work mats for standing in
front of a workbench/machine tool/ whatever. Only thing I wonder
about those is the suitability of using them close to gas fired
appliances. They were also fairly thick IIRC, so I guess I would
probably just lay them down in the middle of the room almost like a
rug, and not try to go under the sink, washer, dryer, etc.

Our dryer is gas, no problems whatsoever. I've laid these mats in the
center of the room as there's really no point in going underneath the
washer, dryer, or sink. I'm sure HF's are cheap, but I bet you can
get the bright colored ones at Big Lots or BJ's, that kind of place.
Those might be thinner than the HF ones and perfectly fine.