How does seat foam density affect office chair comfort and longevity?

Foam density is measured in pounds per cubic foot (lb/ft³) — residential chairs often use 1.5 lb/ft³ foam that compresses noticeably within a year; commercial chairs use 1.8–2.2 lb/ft³ foam that maintains its support level for 7–10 years. Denser foam feels firmer initially but outlasts softer foam significantly. If a chair feels too soft right out of the box, the foam density is likely under 1.8 lb/ft³ — a warning sign for longevity. FindOfficeFurniture.com sells chairs with commercial-grade foam specified by density — call 888-719-4960.