A 46E is a 46 band with an E cup — a full cup. The band does most of the work (around 80% of your support), so if it rides up at the back or the straps dig in, it's the band to fix, not you.
We cut 46E for fuller busts, part of our full 46D–46K range. Not sure 46E is your size? Book a personalized fitting and we'll get it sorted.