for firmly positioning the user in the wheelchair or seatshell for optimum adjustment the 3 plastic buckles are adjustable on both sides made of Codura in the front, solid foam rubber in the middle and spacer layer for improved wearing comfort in the back fastened to the tube by means of plastic belt adjusters (included), clasps or pipe clips with clasps (available as accessory) colour: black cleaning see label Medical device according to (EU) 2017/745