The indoor sled base stack chair with air-vent back is a practical solution when you need to have extra chairs available for special events and unexpected company. A heavy-duty, plastic back with comfortable cushion Seat, molded in an ergonomically contoured design, provides great comfort and reinforces good posture. The air-vented back on this chair allows air to circulate, keeping you cool. A powder-coated frame finish on the sled base protects it from scratches and a front support brace gives it added strength.