The indoor-outdoor stack chair with air-vent back and curved arms is a practical solution when you need to have extra chairs available for special events and unexpected company.This heavy duty stacking chair has an ergonomically contoured design that provides great comfort and reinforces good posture. This space saving chair features a plastic back with special air-vent holes which allow air to circulate and keep you cool. The sturdy seat is made from color matched plastic. A silver powder coated finish protects the chair frame from scratches. These chairs are strong enough to hold up to 551 pounds, but only weigh about 10 pounds each. They're easy to clean and stack up to 5 high for transporting and storage. Non-marring, plastic floor glides protect your floor by sliding smoothly when you need to move the chair.Designed for residential and commercial use, this multipurpose, stackable chair is a great choice for classrooms, sidewalk cafes and your home.