[JRTJH]

We use Coleman tent stakes. They are nothing more than a 10" nail with a plastic sliding "hook" to hold the mat in place. We use 4, one at each corner, through the grommets. It's easy to remove them with a claw hammer. The current stakes are about 5 or 6 years old. It's pretty hard to destroy a nail, and at about 75 cents each, not a "hard to justify" kind of investment.