The "Understated Underband" is where the majority of the support of your bra should come from. This should be horizontal across your back and feel firm but not uncomfortable. The underband should not ride up your back.
The "Crucial Cups" should not give you any "Bounce Back" meaning they should encase your whole breast and if you gently push the wire nearest to your armpit, there should be no bounce, meaning no unsightly bulges. The wire should sit neatly against your skin, flat in the middle right through to the underarm.
The "Supportive Straps" should do exactly that, but only a little. They should not slip off your shoulders and should support but not dig in, remember the majority of the support comes from your underband.