Lifelines are great for keeping crew on the boat, but not the greatest for a backrest. Make yours a bit more comfortable with these wheather-resistant, foam-cushioned lifeline covers. They have a PVC pipe inside to prevent damage to the lifeline and the foam. Then they are covered in your choice of Sunbrella fabric to match your boat's other canvas. If you will be selecting multiple covers of the same type to make a set, it is nessary to distiguish them by selecting the option for cover number, so the shopping cart can distinguish them as unique items. Measurement is easy, just see the instructions below.