I use UnderArmour sports bras. They're made of moisture-wicking material and I just love them. During the summer I wear them anytime I know I'm going to be outside sweating - like the Women's Pro Golf Tournament I went to watch in Maryland - it was absolutely sweltering! I think they give decent "support" too. I'm a C-cup and they hold me in place well enough to jog, do aerobics, and cycle.