We used the polystyrene HDPS material for these porch rockers. The HDPS look like realistic wood but are more durable than wooden, which is the preferred material for outdoor furniture. Imitate but transcend. Although this material seems bulky, it is resistant to sunlight, frost, and rain. The Patio Rocking Chairs will never splinter, crack, fade, chip, peel, or rot when exposed to the elements. You don’t need to spend time painting, staining, or waterproofing this outdoor rocking chair. These porch rockers have smooth rocking, relaxed seats, wide armrests, and ergonomic backrests. We designed the back of this rocking chair to be higher than other rocking chairs on the market, so you will have a more comfortable experience when using it. We used thickened slats so that if a child or someone lightweight uses this rocker, it won't rock as much. That’s why I call it a steady rocking chair. This outdoor rocker is super easy to clean. It is perfect for patios, gardens, lawns, indoors, and more. Its maximum weight capacity is 350 lbs. One person can complete the installation in 20 minutes. Rocking Chair Dimensions: 34.8"D x 22.6"W x 43.7"H