4" HeightType "A"- Type "A" Larger aircraft Cessna 172,182,210 cardinal OVERALL DIMENSIONS 15"side to side and 17.5" front to back. Made of Dupont Cordura 1000 deniers 2lb non flammable foam (firm) the back is 2" thick with a 3" lumbar area it comes with straps to secure the cushion to the back of the seat that when no in use serve as carrying handles.