The Apex Extreme is taking cold weather explorers, cyclists, climbers and back packers to new heights. The Apex Extreme provides the same ability and power as the original Apex but stores its batteries in a remote compartment that can be clipped close to your body for optimal battery warmth and usage in cold temperatures. In addition, the external battery pack reduces the weight on your head. Having the longest burn time of the Professional Series, the Apex Extreme is perfect for winter months when the nights are longer and the temperatures are dropping.