Back support belt - supports your lumbar spine while sitting, even on a stool or bench.
First photo shows a similar Amazon product. 2nd photo shows the version we have.
Very similar to the Amazon product below.
Back Support belt for better back whole day Back Pain Relief -Posture Correcting Harness & Relieve Sciatica, Keeps Back Straight While Seated, Suitable in Office or At Home or Outdoors (silver-gray) https://a.co/d/hWvjhWh