Monoqool has made a series in the unique NXT@ material, which is extremely strong and lightweight. This has helped them to make eyeglasses with ‘volume’ without adding weight. So the frames weighs only 5 grams. The NXT material was first developed by the US military for the usage in windshields in helicopters. The NXT series also comes with photochromatic frames, where the fronts of the frame change colour when exposed to sunlight. Indoor the frame is light grey, and when you go outdoor the frames turn almost dark (not the lens, but the actual frame). A bit of magic.