I am looking for a waterproof jacket for winter rides that turn out wet. Something that can sit in my jersey pocket and only come out when it starts raining and go back when it stops. After a lot of searching the only one i've found so far that will definately fit in a pocket is the Montane Featherlite H2O. Any comments on this one - like is it really waterproof. Any others to consider ? Budget up to £60 or £70 if its on Wiggle.