The winter cycling cap has been a subject we've avoided for the last few years since moving down here to Texas. It's a fickle beast. Make it too warm and the rider overheats, making the cap wearable only for race spectating or snow shoveling. Not warm enough and it defeats the purpose entirely. Thereby our goal with this iteration of the winter cycling cap was to strike the perfect balance between warmth and versatility.
This mindset was especially important when it comes to the earflaps, "atmo" the body of the cap should retain the heat, while the earflaps are mainly used to block the ears from windchill. In this way many other caps, our own previous winter caps included, often cause the rider to overheat by using too heavy of a fabric for the flaps, be it fleece or wool. For our caps we've used a double-sided cotton and spandex blend that easily stretches over the ears and can just as easily be folded up over the back of the cap when not needed.