Serious rain protectionthis is your perfect jacket if you39re looking for total waterproof protection in a small package sacrificing a bit of breathability to get a workhorse jacket that39s ideal for commuting or training in the rain this isn39t the cost is no object jacket of a castelli pro race piece but comes near to them in packability and matches the waterproofing of top end products the 25 layer fabric features a durable woven outer shell with a waterproof polyurethane membran