Made from a merino wool and silk blend, the Wool Transition 12 Sock from Castelli is an ideal choice for cooler rides when comfort is key. Here in the office, we're big fans of wool. Few synthetics can rival its softness and its ability to keep your feet warm and comfortable while letting moisture evaporate. This breathability is especially important during winter cycling when we'll use dedicated cold weather shoes or some sort of overshoe bootie. Without the ability for moisture to escape, perspiration will build up and your feet will get wet and actually become colder, faster. As an added bonus, wool is naturally odor-resistant, so we can often get in a few wearings before needing a wash. Its 12cm cuff offers just enough ankle coverage without looking like you're wearing compression socks. They're available in Dark Gray and Black and come in three sizes: Small/Medium, Large/X-Large, and XX-Large.