Spring Unit: DualFlex. Back Construction: Attached. Seat Construction: Attached. Seat Cushion: High-Density (HC). Zero-Gravity reclining technology puts you in a neutral posture position, providing spine and knee support, and accommodates occupants weighing up to 350 pounds. Single USB port is included on the power control. Removable back allows for easy lifting and maneuvering through doorways. Two power buttons allow you to operate the reclining and headrest mechanisms independently. Power allows you to smoothly recline to any position, adjust the headrests, and adjust the lumbar supports. On styles with arms, a home feature returns the headrest, footrest, and lumbar support to their original positions. A single USB port is included on each power button control on styles with arms. Power to the USB port is activated only when the port is in use.