Many people opt-in for a long-sleeve base layer in winter because you get extra warmth and protection. I think that the Craft Active Extreme X short sleeve base layer is an exception to this rule since it can be used on most deep winter days (depends on where you live, of course!).
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According to the official brand guidelines, the recommended temperature range is 23°-50°F / -5°-10°C. However, because winter in my area is relatively mild, the lowest temperature I could test this base layer in was around 32°F / 0°C, and it was more than capable of keeping my core warm and comfortable.
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It is so warm that when the temperature outside is above 50°F / 10°C I am overhearing while wearing this base layer. It is worth noting that I am primarily using this base later on high-intensity rides.Â
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Overall, I am so impressed with how warm the short sleeve Craft Active Extreme X base layer is so giving it a top score of 10/10 for the warmth.