Castelli Flanders 2 Long Sleeve Base Layer Castelli's warmest base layer, the Castelli Flanders 2 Long Sleeve Base Layer is the essential foundational garment for any cold-weather cycling kit. SottoZero Fleece traps air and, warmed by the body, ensures you remain insulated from temperatures that hover around freezing in single digits. Just as vital for winter comfort is breathability, which prevents sweat from causing a chill. And here the Flanders 2 utilises mesh armpit zones to allow sweat a quick escape route, while the fleece construction also wicks sweat quickly off the skin to ensure...