Castelli Women's Pro Mesh Sleeveless Base Layer The Castelli Women's Pro Mesh Women's Sleeveless Base Layer is the sleeveless version of Castelli's pro-level short sleeve base layer. It's ideal for those scorching summer days when temperatures are high and you want to wear a sleeveless cycling jersey. It's even good in winter, slipping easily under a heavier-weight base layer to improve sweat-wicking. The light mesh and tailored fit means you'll soon forget it's on and thanks to excellent moisture-management it ensures you remain comfortable across a wide range of cycling temperatures and...