A head mounted display (HMD) device for supporting virtual reality and augmented reality includes a frame and a thermal door component between which a mobile device may be sandwiched. The thermal door component includes a first portion that is substantially planar for reversibly coupling with a portion of a back surface of the mobile device and a heat sink. The heat sink includes a substantially planar portion coupled to a surface of the first portion of the thermal door component. The heat sink may be made of magnesium or other thermally conductive material. A second portion is coupled to the back of the first portion. An opening, channel, or recess that allows access to the interior of the thermal door component by ambient air to allow the thermal door component to draw heat away from the mobile device and the HMD device.