Advanced Elements Kayak Backbone - The Advanced Elements Backbone is a 'spinal column' for your inflatable kayak that will improve tracking, rigidity, and overall performance. The Backbone is inserted under your floor cushion while your kayak is deflated. Once the kayak is pumped up, the backbone creates a bow-to-stern frame which enhances performance and rigidity. While the bow-to-stern beam is straight, the side-to-side silhouette has a slight v-bottom. The backbone is constructed of an anodized aluminum shaft with rubberized foam. It features a collapsible breakdown construction that fits in a carrying case and allows you to easily store the Backbone.