It is often difficult to sit comfortably on a kitchen chair, a couch or even some office chairs (e.g., when they are too deep). To better support your pelvis, here is a memory foam lumbar cushion that we selected with the greatest attention. Its stabilty is ensured through an anti-slip bottom, combined with two elastic strap bands. It is easily adaptable to most chair backrests. 
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ADVICE: the cushion should support your belt (i.e. pelvis), and not fill the hollow shape in the lower back.