Spiral into a captivating workspace with the helix extended-height chair. made of mesh, the seat and back allow you to keep your cool through all your biggest projects. and with the ratcheting teardrop seat back and footing you can easily add a little style and comfort to any workday. helix chairs offer an abundance of features including 360-degree swivel, pneumatic height adjustment, tilt lock and tilt tension. sturdy and reliable this chair is rated up to 250 lbs. and comes in your choice of three fabulous colors black, green and blue.