The Strap Pad Y is a very soft pad designed specifically for use with the AirFit N20 and Wisp headgear.This will cover the side straps as well as the buckle where the back headgear attaches, but it will still allow access to the buckle for mask removal. The Wisp Strap Pads have been replaced by the Strap Pad Y. These are extremely simple to set up.