An overshoe that covers a footwear structure for protecting a walking surface. The air bag system contains an air bag, which advances in a main inflating direction when the air bag system is triggered, and a gas generator for supplying the air bag with pressure gas during triggering of the air bag system. The wireless monitoring apparatus automatically analyzes the patient’s heart rhythm and communicates with the AED system. The toe angle and the camber angle are corrected based on a thrust angle and an attitude angle. In one embodiment, the second coding process is a layered coding process. A cam member is pivotably connected an end of the retaining member such that the retaining member is lifted to secure the blade between an inside of the recess and the inside of the groove by pivoting the cam member.