IT IS REAL!! When the Nordica rep first showed it to me he was not able to explain the tech behind it , so when I sold boots with Outlast I said it it was vodoo science. Later I met the with the reps from outlast and got the offical explanation and they gave me some toys to actualy demonstrate how it works . In layman terms it is a high-tech wax , remember that there is a transfer of heat when materials change form --ie. from solid to liquid --or back.The final test was when I got my Beast boots last year which have Outlast footbeds and liner. I promptly replaced the footbeds with my custom beds, and my first day skiing with outlast was interesting. I had the boots outside for 20 minutes before puting them on & skiing (could not be avoided)The first 3 hours my feet were nice and warm except for the bottoms of my feet, that was like walking on cold marble.I had some super feet corks made , since they have Outlast material and use them when I got in the same situation. In the interm I am trying to get Outlast material that I can laminate on the full wieghted footbeds that I make. From my expierence it works , it is a wonder material like windstop.