Which foam is the softest?

The softest foam is typically very low density open-cell memory foam or low ILD latex foam, with softness measured by ILD or IFD, and the softest types include low-density polyurethane foam, memory foam with ILD under 12, and natural latex with ILD under 14, similar to soft cushioning. Among common foams, the softest is often called super soft foam, which is low density polyurethane foam with ILD around 8 to 12, used for pillows and mattress toppers for plush feel. Memory foam can be made very soft for pressure relief, with some toppers having ILD as low as 10, feeling like sinking into cloud. Latex foam softest is around ILD 14 to 19, called soft latex, which is softer than medium but still supportive, not as soft as memory foam. For upholstery, softest foam is often called soft foam or low density foam with density around 0.8 to 1.2 pounds per cubic foot. In general, the softest foam is low ILD memory foam used for mattress toppers and pillows, providing plush, sink-in feel, similar to soft Packout foam insert for delicate items, but for seating, soft polyurethane foam is softest, providing comfort but less support, so softest foam is low-density, low-ILD memory foam or polyurethane foam.