Needless to say, we get excited any time that a new item is added to Castelli's Rosso Corsa line. However, we know that our cycling love runs especially deep when that item is a base layer. In our defense, though, a proper base layer is one of the single most important pieces of winter apparel that you should own. Knowing this, Castelli created the Flanders Long Sleeve Base Layer to be its most sophisticated winter base layer to date. To start, the Flanders base layer features multiple fabrics in multiple locations. In other words, Castelli was dedicated to applying the right tool for the job. At the body, the base layer uses a multi denier multi weight polyester composition. This material was created with a rib knit, 3D structure that enhances mechanical moisture wicking, while also creating a stretchable, conforming fit around the torso. However, it's important to note that this design essentially creates channels that keep the fabric largely off of your skin. Ultimately, this reduces, if not eliminates, the threat of abrasion. At the underarms, a natural evacuation point for excess core heat exhaust, Castelli placed a perforated mesh polyester. And, as you probably guessed, perforation equates to ventilation. As a result, your body temperature remains well regulated, which prevents the threat of overheating. For the sleeves, Castelli retained the lightweight polyester theme of the base layer, only the fabric used here features a four way stretch. This way, you're guaranteed an uncompromising freedom of movement. Further along with the construction, you'll find that Castelli only used four needle flatlock stitching throughout. This construction method equates to a lower profile seam and a flat stitch. And, as a result, the base layer lays closer to the body, which makes for increased moisture management and no chafing. Lastly, Castelli sought to ensure that your body obtains total coverage, and to do so, it incorporated a mock turtle neck and an elongated ...