The Customized Protector is meant for outdoor use. This Protector is the same as the Original Protector EXCEPT it is more customizable. Your order is placed according to 3 measurements, circumference (distance around) of upper leg, circumference of lower leg and height. This is great for back leg injuries that are considerably larger at the top of the cast/bandage than at the foot. This also works in reverse. There are some splints and braces for front legs that hold the foot in a “spoon” which make them much larger at the foot than at the top.