I was surprised at how lightweight this bra is. I love it for backcountry skiing - since it's so lightweight my sweat dries way faster than a normal bra, which is super important being out in the snowy cold! I wore this running and did not think the support compared to my trusty old Brooks smash 'em bra. Too much bouncing. I am a HUGE fan of the CW-X running tights - and when I saw that they made a bra, I had pretty high expectations. The picture of the bra looks as if it has the same type of support bands as the tights do, but they are the not the same at all. So, I wouldn't recommend this bra for anything high impact, but it is great for skiing, hiking, and climbing.