Features a thin foam back design ... perfect for use with Hobie Vantage seats. This thinner back profile provides more mobility and comfort, while reducing interference with tailor seat backs. New "Graded Sizing" gives a better fit for a different body size. Sculpted foam panels also contribute to a more comfortable PFD. Along with providing a great fit, the Thin Back also features multiple pockets that will hold a beverage, your sunglasses, and other small items.