The chair.

He sat in his high backed green vinyl  chair.

The cushion had been his idea. A remnant of a wheel chair. It had hollows in the rubber casting that allowed greater circulation. A sign behind him read "Stop pressure injuries your skin matters". He had always felt comfortable in his own skin. It mattered.

The chair also had little wheels at the back. Maybe they were left over from when it had been a full blown wheel chair. Never used, it had lost this ability and now were adapted for not scratching hard floors. 

He rested his head on the raised back rest. A useful adaptation for long night stay overs.