Stohlquist's Graded Sizing™ offers the best fit, and lowest footprint possible, for the widest range of body types. We have fine tuned each individual size, and sculpted the foam footprint and foam thicknesses to provide a better fitting, and more comfortable PFD for people of all sizes. This allows us to fit younger, smaller framed paddlers up to larger adults in the same style vest, while offering the same amount of mobility and a low-profile fit across the entire size range.