The most important feature of a winter cycling glove is proper wind protection. The outer layer should be wind-resistant, if not 100% windproof. For the thermal layer, brands have different concepts. In most European countries, insulation isn't so important, as the body warms up naturally when cycling. It's more important to pay attention to the right size and, in case of any doubt, to go a little bigger. For truly frigid temperatures, three-finger gloves and mittens are available.