For all guitars where the neck-body joint angle is quite pronounced. Your Les Paul, Jet, Penguin, PRS Hollowbody or even the small body ES models (339) are being kept safe.
It is thicker than the LEO to accommodate the extra padding necessary to protect guitars with an angled neck-body joint.
It has an extra thick neck support to keep that headstock safe and a movable body wedge, to support different body depths.