CMOB11 Comfort Matta Open The Industrial Heavyweight. Comfort Matta Open is able to withstand extreme temperatures, making it excellent for welding applications where slag and other particles can easily fall through the drainage holes in the tile. Comfort Matta Closed can be used for any dry application from in front of workbenches and presses, to assembly lines as long as ootball fields. Comfort Matta is easily installed, and provides unsurpassed comfort and durability making it a sound investment for years to come.