How does it layer over a shak one size smaller? It looks a tad short in the pic on the website, so I was wondering if it would cover a shak. I have a small shak, and all my ibex is small, so I am thinking of ordering the pingo in a medium to layer over my small stuff. You said water beads up on it. Would you think it would be waterproof if you were riding in the rain, or would the rain eventually get through? Its so purty, and the blue matches my bike..........

What temp range would be suitable to wear this in without overheating?