At my age I am all about comfort and totally exasperated with bras that feel like a tourniquet.  To be comfortable around, the cups are too big.  If the cups fit, the band is too tight.  I ordered the largest 3X size which per sizing chart is too big for me but it fits how I like and is comfy.  It supports enough to keep the jiggles at bay.  And not too hot.  Maybe not for you if you wear form fitting tops and are really well-endowed.