Foam density determines how long your lounge maintains its shape and comfort. Measured in kilograms per cubic metre (kg/m³), density indicates how much material is packed into the foam, not how firm it feels. For daily-use lounges, you want high-density foam of 29kg/m³ or higher.

At Chilli Pip, we typically specify foam in the 31-35kg/m³ range for seat cushions, paired with firmness ratings between 130-200 Newtons, depending on your preference. The density number (first number) tells you durability, while the firmness number (second number) indicates feel. A 31-190 foam is a high-density medium-firm foam, ideal for most households.

Low-density foam (under 24kg/m³) feels comfortable initially but compresses permanently within 12-18 months, creating that “sagging couch” effect. Medium-density foam (24-28kg/m³) works for occasional-use furniture like guest room seating. High-density foam (29kg/m³ and above) maintains resilience through daily use for years.

For family lounges with children and pets, request foam density of at least 31kg/m³. Back cushions can use slightly lower density since they bear less weight. The firmness selection is a matter of personal preference—softer foams (130-150N) feel plush, while firmer options (190-250N) provide more support.

Remember, higher density costs more upfront but prevents the need to replace cushions or reupholster prematurely, making it the most economical choice in the long term.