Foam Density: Seat 3.5 lbs, Backs 3.2lbsILD's: Seat 38lbs, Lower back 28lbs, Upper back 20lbsRelated ArticlesCushion foam: How do we know it will last?What is Anthros’ commitment to being environmentally conscious?How do I unbox and assemble my Anthros?What are the most common setup mistakes new owners make?How do I repack my Anthros for a return?