Oakworks uses the highest quality US Made polyurethane foams in its products. Each option has a unique combination of different foams and thicknesses to create the best balance of performance and comfort for your needs. Please consult specific product literature to see the padding options available: not all options are available on each product. 2.5” Comfort Foam™ Comfort and support 4” Aero•Cel™ Superior comfort 3” Comfort Foam™ More comfort and support 6” Aero•Cel™ Luxurious comfort 4” Comfort Foam™ Superior comfort and support 3” Plush Comfort and lighter weight Imaging table top pads only 1.75” Firm Response Very firm (Physical Therapy tables only) 2.5” Semi-Firm Light weight (Portable tables only) 1.5” Firm Our firmest padding