NPS 9204-SV-CN Vinyl-upholstered Dome Back Stack Chair with Steel Silvervein Frame, 300-lb Capacity, 18" Length x 20" Width x 34" Height, Blue (Carton of 4) 2-inch thick grade A foam waterfall front upholstered seat 1.8-inch density foam grade A cushion Strong square tubular steel frame with side stack bars Vinyl and foam are CAL-117 rated Under-seat H-Brace for added rigidity