This is a piece that pro riders consider essential but that isn't used very often by regular cyclists. It's a thermal vest with no wind protection; the simple use of our mid-weight Warmer X-Stretch fabric provides a good bit of extra warmth for your core, but without trapping moisture inside a membrane. It's ideal for high-intensity riding in cool weather or staying comfortably warm on a mild-temperature recovery day. Find out why the pros always have one in their race bag.