We purchased 2 area rugs and 1 runner for our beach condo.  Since these are indoor/outdoor we hope that they will be very durable and easy to vacuum sand from.  For one of the area rugs we added a felt non-slip pad to provide a little more softness since it is in the living area.  The other area rug is under a dining table so nothing was necessary.  We did have to add a non-slip backing to the runner as it was moving all over.  Once the backing was added though it solved that problem.