Awesome leggings, great customer service.
I wasn't sure what size to get, since I'm a 27-28 inch waist but a 39 inch hips, putting me between S and M sizes. I reached out to them by email and they suggested M, saying it should still fit my waist, and it does!
My full measurements are: 5'5" tall, around 30-31 inch inseam, 27-28 inch waist, 39 inch hips.
They feel so smooth/soft, and even though I haven't swam with them yet, I believe they'll add some warmth. I really like the pockets! I also love how long the leggings are, since so many leggings brands end up looking like high-waters. You can see in the pictures that I folded one leg up to where it ends at my ankle, showing how much extra fabric there is available.
I'm sad that it looks like they're selling out of the SpongeBob patterns, they were my favorite, but glad I got to snag one last-minute!