The backbone is a multi-sectional keel beam that you assemble and install under the inflatable floor inside of your kayak each time that you set it up. Once you sit inside of the kayak, your body weight presses the backbone downward, creating a v-shaped hull which is what enhances the tracking and hull speed of the kayak. Package length: 83.566 cm Package width: 18.541 cm Package height: 11.684 cm Product Type: OUTDOOR RECREATION PRODUCT Sport type: Kayaking
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