hand warmers, purchase in costco or BJ's, $13 for a box. start out with a compression shirt, than a FITTED shirt (UA or whatever), than a loose (light) thermal type. years ago the thickness of these 3 items would have equaled 1 heavy shirt. outter layer should be another light jacket. i use a sun mountain rain jacket. you can use long or short sleeve.. this is a non-bulky attire. as for the ball i would think a soft compression would be better.