Thick Backrest: Sturdy And Durable, Providing Support For The Back, Comfortable And Safer, Detachable Back, Humanized Design. 1 Backrest. 1 Armrest. 1 Seat Cushion. Thickened Sponge: The Cushion Is Filled With Thickened Sponge For Softness, Cushioning, And Comfort.