This is your jacket if you're looking for total waterproof protection in a small package and are ready to sacrifice a bit of breathability to get a workhorse jacket for commuting or training in the rain. This isn't the cost-is-no-object jacket of Castelli's pro race pieces, but it comes near to them in packability and matches the waterproofing. The 2.5-layer fabric features a durable woven outer shell with a waterproof polyurethane membrane rated at 10,000 MVTR. It packs to a small size that easily fits in a jersey pocket, ready to give you full waterproof shelter if the weather should turn. Castelli have given it a high neck, a long tail and a stuff pocket for when you need to carry it.