Travel Ease appears once on this site, in lumbar and seat cushions, with its memory-foam lumbar cushion.
A back cushion, not a seat cushion. It is the only back cushion in the hub; the AUVON, Cexovo and Healthfix go under you. It is shaped to follow the upper, middle and lower back, in slow-rebound memory foam that Travel Ease says will not go flat, and measures 43 × 40 × 11 cm (16.9 × 15.7 × 4.3 in).
Two straps. Two adjustable straps with flexible buckles reach up to 145 cm (57 in) around a chair, car seat or armchair — what stops a back cushion sliding down each time you shift. The cover is wrinkle-free, breathable, machine-washable and antistatic.
Two cautions from the listing. It may not fit some smaller car seats, so check the size first; and in a car with side airbags, the straps must not be fastened, so the airbag can deploy. At 11 cm (4.3 in) thick before compression, it also moves you forward on the seat — check your seat depth again after fitting it; setting up a new office chair shows how.
The price. It is listed on Amazon.com, but no US price could be read when we checked; it read about €40 on the European stores and £40 in the UK.