Columbiamens Glennaker Lake Rain Jacket Shell Jacket (pack of 1)

Is it made out of a breathable material?

Some say sizes run large; for cycling I don't like a floppy windbreaker. Any owners out there 5'10", 170#, 40" chest? I'm thinking Medium?

Is this a good warm(90°)weather jacket only for light rains?

How do you fold it up into a pouch like in the photo?