The Caliente Thong is a solid choice. I have one in the Royal (blue) color. It’s unlined, so the lighter colors may not be fully opaque when wet.
I’m not a fan of the metal logo on the front, especially since there’s also a tag on the hip, but that’s my only complaint. If you like how it looks in the photos, you’ll likely be happy with the Caliente Thong.
I wear a size small and would say it’s true to size, but many of the reviews I’ve read say it runs small. If you’re at the upper end of the size range on the chart, you might want to order one size up.
For the price, I prefer the new Grand Axis Thong, which is a similar, although lined, style. However, I wouldn’t dissuade you from trying the Gregg Homme swim thong if you prefer that look.