When sitting in the Boat Helm Chairs, a high-quality seat cushion from Alu Design As will protect your knees and lower back. The curved, perforated top of this cushion adds added comfort and support to the upper thigh area. For easy mobility, it's made of robust but lightweight closed-cell foam atop a durable, high-pressure injection-molded plastic base with connected handles on the front and back.
https://www.alu-design.no/boat-helm-chairs