The Dainese air frame jacket I linked back there is awesome. Been wearing it three seasons now. even in the rain, its a champ, very light and airy too. Though I dunno if I'd get it in black a second time around.
Re nerve compression: are you leaning all your weight on your palms? Try keeping your core engaged more and not resting on your palms/wrists. Builds ab muscles and prevents those weird hand tingles. Also, wearing a wrist watch can restrict blood flow.