My brother-in-law has very little body fat and as a result he gets very cold, we often see him turn shades of blue you only ever see in zombie movies, the Traveller Gilet from Blaze Wear could be the ideal product to bring back the colour in his cheeks (and legs). Now, sometimes wearable tech isn’t the most stylish of things, but this gilet looks rather smart, you wouldn’t even know it harnesses a heat-boosting superpower.