The castelli riparo rain jacket this is your jacket if you39re looking for total water proof protection in a small package ready to sacrifice a bit of breathability to get a workhorse jacket for commuting or training in the rain this isn39t the cost is no object jacket of our pro race pieces but comes near to them in packability and matches the waterproofing the 25 layer fabric features a durable woven outer shell with a water proof polyurethane membrane rated at 10 000 mvtr it