Fasten this back rest on your kayak to give your back a break on long paddling trips. The back rest is easily installed just by clipping into your kayak's attachment points, and once installed in place, adjust the strap for fit. A great comfort enhancer for long-term use. Specifications: Material: EVA Oxford cloth Thickness: 13mm / 0.51in Size: 24 * 53cm / 9.5 * 20.9in (H * W) Package weight: 268g / 9.4oz Package List: 1 * Kayak Back Rest Notes: 1, Please allow 1-2cm (0.4-0.8") differences due to manual measurement, thanks.