They are a low rise trunk with ultra plush microfiber waistband. It took a while but I've found that the loop sling is really cool and comfortable. The advertising blurb says that
C-in2 UNDERWEAR is made from the softest, finely woven cotton jersey. The super soft waistband completes a design which, within minutes of wearing, comfortably conforms to your body as no other brand of men's underwear does. Once you switch to C-in2 and the C-in2 Sling Support, you will see and feel the difference, and there will be no turning back.
Here's how the sling works: