When I bought my drysuit a couple years ago, I had to buy fins with a larger foot pocket to accommodate the rockboots. Since then, I have been very happy with my Turtle fins retrofitted with XS Scuba spring straps. Large foot pocket and negatively buoyant. Great for frog kicks. Unfortunately, with the spring straps + cavernous foot pocket, when I dive wet, my smaller wetsuit booties really don't fit well. I wanted to get a lightweight alternative fin that would ideally have a fin pocket that works with both my drysuit and wetsuit boots. The solution to my problems was the APS Mantaray fins (a.k.a. Deep Outdoors Six Gill fins). The XL size has a foot pocket just large enough for my Bare Trek drysuit boots. The adjustable strap makes it easy to switch between my drysuit and wetsuit boots. The fins come in various colors with various buoyancy characteristics: slightly positive (blue), neutral-to-positive (white), and slightly negative (black). I won't say that the fins are super-fast or super-powerful, but they are quite maneuverable. Very good for the frog kick. Still, I don't think I buy into the company's dual-channel marketing mumbo-jumbo. IMO, the best thing about them is that the blade is lightweight and shorter than other conventional fins, so they pack up quite nicely in carry-on luggage (if you don't want to put them inside larger, checked luggage). Check 'em out if you can. The owner of the company lives in the San Diego area and will let local divers test-dive them for free. Nice guy.