Higher price dedicated shotguns are featuring palm swells regularly...but many fine guns are old enough that they lack this benefit.
Some have resorted to add-on patches taped or glued to the stock. This obviously has limitations...not to mention compromised aesthetics.
GripSwell™ Shooting Gloves was founded because of the need for this Palm Swell feature. Our gloves were developed by our engineers using ergonomics in design, and were tested with many hours of refining and shooting, culminating with the development of the model Palm Swell GS-1!
