The connection part between the seat and the back of the chair completely fits your lower back. When you sit, the lower back will not exert any effort, while other hollow-out back rockers needs much effort and you cannot really relax your back.The supporting force from our chair back reduces the pressure on the lower back, and truly relax you when you sit. Other vertical backs cannot achieve this effect. The curvature of the back of this chair and the seat ensure the comfort of your body.Do you want a durable outdoor chair? This is a all-weather resistant outdoor Adirondack rocking chair. It can be used on the Patio, Lawn, Campfire, Fire Pit, Garden, Poolside, Backyard, Deck, Front Porch, Beach etc. It withstands summer and winter. It is more durable and can withstand direct sunlight, and is not easy to rot in damp places.The rockers are made of Poly-wood materials, which is super heavy duty and sturdy once assembled. You will be very impressed with Poly-wood! They look nice with natural appearance and does not look like plastic.With stainless steel fasteners,it will weather perfectly. With the heavy weight, it will not be blown over in the strong winds, great for outdoor use.For outdoor use, would you prefer a chair that is easy to clean? If you live in a place where the weather is changeable and the chair is easy to get a lot of dust.