Pads are sold in densities of 5 to 24 pounds per cubic foot. In general, the heavier the pad, the more durable and supportive—but less cushiony—it is. Choose one that's at least 6 pounds.
"If you have a little room in your budget to upgrade, go for a premium pad rather than a pricier carpet. A quality cushion makes any carpet look, feel, and wear better." —Tom Jennings, World Floor Covering AssociationRebonded pad
Adding memory foam, a polyurethane blend, makes this 8-pound pad more comfortable. Charity cushion, about 59 cents-79 cents per sq. ft.; Shaw Floors