Fasten the harmony sit-on-top back band to your kayak and give your back a break on longer paddling trips. The back band straps clip into your kayak's deck rigging via corrosion-resistant Hardware. The back band's 0.5 in (13mm) padded closed cell foam is covered with a smooth nylon shell. A great comfort Enhancer for long-term use. At 9.75 in x 27 in (25cm x 68.5cm), this fully adjustable sit-on-top back band provides the much needed lumbar support that you want for those long days on the water. Go ahead, paddle further. Your back won't stop you.