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The D-2500BR features a motorcycle-style cushion with cushy tuck-and-roll padding for supreme comfort and support. The slim backrest permits free arm movement and adjusts forward/backward and up/down for perfect lumbar support. A single Knob Bolt allows the backrest to attach and remove easily for quick setup and easy transport. The D-2500 is backrest âreadyâ and shares all the features of the D-2500BR but without the backrest.