Can one put some sort of material on the bottom of a thermarest pad to increase friction?

Perhaps the non-poky side of velcro or some other material and tape it to the bottom in various sections. This cheap alternative plus under insulating the pad seems like a good solution to slippage. Anyone have experience in this?
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"To me, hammocking is relaxing, laying, swaying. A steady slow morphine drip without the risk of renal failure." - Dale Gribbel