RTM Delux Backrest for Sit on Top Kayaks. Constructed with a foam core and durable tear resistant covering, it is held in place by substancial webbing straps and metal spring clips. The Deluxe features a seat base which allows the paddler to brace themselves into the backrest as well as providing cushioning from the hard surface. The Deluxe backrest also benefits from a handy rear pocket. It is ideal for back support when paddling or surfing and is especially suitable for those paddlers who suffer backache.