Backrest

A backrest is the structural component of a seating unit designed to support the user’s spine and torso while maintaining an ergonomic posture. Its primary function is to distribute the weight of the upper body, reducing pressure on the lower back (lumbar region) and minimizing muscle fatigue. Backrests are found in everything from office chairs and sofas to car seats and park benches, with their design often dictated by the intended duration of use.