Especially when the leo is low-back. There's less fabric there to hold on to the shoulders. But I love the low-back look better than anything. I wear adult size large, and when I first put on a lycra low-back leotard, it tends to slip off the shoulder easily. But once I start exercising, that takes care of the problem. Just a slight amount of sweat moisture on the skin is enough to make the leo cling faithfully to my body.[/i]