The Alpha SmartTemp AK Liner featuring Outlast® combines silicone with the heat management technology of Outlast®. This revolutionary liner regulates heat by responding to fluctuations in skin temperature. The Alpha Smart Temp AK Liner absorbs and stores heat as it builds up in a residual limb delaying the onset of sweat before it starts. By releasing stored heat as the body cools down, the liner stabilizes skin temperature to keep an amputee comfortable all day. The Alpha SmartTemp AK Liner uses Select fabric that allows circumferential stretch for easy donning. Yet the one-way stretch fabric controls pistoning without using a distal matrix. The Alpha SmartTemp AK Liner retrofits with any Alpha Liner having a symmetrical AK profile.