A Low Profile hip protector hits the sweet spot for most recreational skiers. Under normal ski pants, it won't be obvious—you might see a slight outline if you're wearing very tight or fitted pants, but it won't look bulky or noticeable to others on the slopes.
This option gives you a solid balance between real impact protection and discretion. You get enough padding to actually help in a fall, without the visual bulk that makes some skiers self-conscious or tempted to leave their protector at home.
If you wear standard or relaxed-fit ski pants (which most people do), Low Profile is usually the best choice. It's only worth going to an Ultra Low Profile if you regularly wear fitted pants and prioritize looking invisible over maximum padding. And if you have higher medical risk factors like osteoporosis, don't sacrifice protection for discretion—consider a Standard Profile instead.