http://www.lowes.com/pd_155419-20787...site=shopLocal

I buy these at Lowes, and put one under each swing, then fill the holes with sand. It's soft, thick, and lasts for years. I have two that are 14 years old, and they have been outside in the hot sun this whole time.

I bought one on Saturday to put over the rocks, and I paid $20.

Anti Fatigue Rubber Mat

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