Cascade Designs Discovery Kayak Back Rest - Discovery Kayak Back Rest - Increased comfort in your boat means you'll have a more enjoyable time on the water. This self-inflating lumbar cushion is specifically designed to help relieve lower back fatigue while kayaking. The low-slip polyester fabric minimizes slipping, holding you comfortably in place. A high-flow air valve allows the cushion to be quickly inflated or deflated. Velcro tabs make for hassle-free attachment to your existing seat back.