Cat Tracks are designed to attach to the underside of your ski boots.  Simply pull them on and go.  They will easily fit inside a jacket pocket once you are ready to ski. The Cat Tracks provide great traction while walking and they help to decrease wear and tear on the ski boot soles.  They are especially helpful for skiers who are not used to walking in ski boots and skiers who spend lots of time in their boots.  It is also important to use them with race boots that do not have replaceable toes and heels.