Abstract: An interchangeable heel member comprising a locking mechanism is provided. The locking mechanism comprises a pin member operated by a button. The interchangeable heel member is coupled to a shoe by means of the pin member. The shoe comprises a groove provided at a heel plate. The pin member is made to fit in the groove to hold the interchangeable heel member to the shoe. In order to remove the interchangeable heel member from the shoe, the button is pressed and the pin member is released from the groove. The interchangeable heel member is replaced with replacement heels that differ in height or diameter.

Abstract: Example implementations relate to providing head and neck support. An example system includes a helmet, a load bearing harness, and a flexible extension coupled between the helmet and the load bearing harness. An activation of a magnetic field proximate the flexible extension causes a ferromagnetic infused medium to transition from a fluid state to a substantially rigid state causing the flexible extension to transition from a flexible state to a rigid state. When the flexible extension is in the rigid state, force applied to the helmet transfers through the flexible extension to the load bearing harness. The system further includes a sensor configured to detect an event. Particularly, the sensor causes the activation of the magnetic field proximate the flexible extension in response to detecting the event.