A 38H is a 38 band with an H cup — a deep cup that's hard to find on the high street. 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 38H for fuller busts, part of our full 38D–38K range. Not sure 38H is your size? Book a personalized fitting and we'll get it sorted.