Winter layering choices just got a whole lot easier with Castelli's Men's Prosecco Short-Sleeve Baselayer. Finding a balance between too-light summer layers and overbearingly heavy fabrics, this mid-weight base layer tucks stealthily under your favorite winter kit for consistent warmth whether you're hammering intervals or out on a social spin. It's fashioned from Castelli's dual-layer Prosecco fabric, which ushers moisture out and away from your body for quick evaporation so you stay comfortable and dry.