Foam sheet thickness is a key factor when selecting foam for upholstery and comfort products. Whether you're creating a mattress, chair cushions, or other soft furnishings, the thickness of the foam sheet determines the level of comfort, support, and durability. Thicker foam sheets tend to be firmer and more supportive, making them ideal for structural purposes in furniture. Meanwhile... http://mayoworld.com/soft-pu-foam-sheet-extra-firm-thickness-density-73386