The Castelli Alpha RoS Light Jacket
RoS stands for Rain or Shine it is a label Castelli have introduced for a line of premium products that offer the absolute best compromise for mixed weather. So a RoS piece might not be the most breathable piece we do - it might not be the most waterproof piece we do but it offers the best compromise of both. And let's face it, most days in the UK especially in spring and autumn we arent riding in heavy prolonged rain we are riding in damp misty weather or through showers or just against the wind. For these sort of conditions look out for RoS.
The Castelli Alpha RoS Light Jacket is a major step forward from the original Alpha Jersey, it features all new fabrics to greatly increase its water repellency with a reduction in seams and seam sealing where required to further enhance its resistance to rain. We also see new waterproof zippers, pocket drainage and cross wrap over under wrist closures. All this to create a garment we call functional waterproofing, it might not keep every drop of rain out but it will leave you as comfortable warm and dry as possible in more situations than any other garment.