Versatile weatherproof seats are double-contoured, roomy, and resilient to produce a combination of multidirectional flexibility with full support, the key to increased shock absorption and reduced seating fatigue. Molded with deep-rolled front edges to eliminate pressure points, seats and backs have textured surfaces for sitting traction. The fold-down back features self-lubricating hinge points. A molded rib pattern accommodates spiders with a 5" x 5" or 5-3/8" x 5-3/8" hole pattern for easy installation. Includes cushion.