If you like to use the furniture lying on your back, we recommend the eighty centimetre with 65 cm backrest height, because you can put your legs under you and sleep comfortably on it, e.g. on a Sunday afternoon during Formula 1. If you prefer to sit with your back stretched out, or work sitting on a sofa, we recommend the 70 cm with a 70 cm high backrest, which is closer to the position of the chair. If you prefer both, then 80 cm, because with our thick and sturdy Whale cushion, you can narrow the depth of just one position. Check out our video!