I use my same set of Jets (size XL) for everything from warm ocean wetsuit to drysuit cave dives. For me, they are a great balance of stiffness and flex. Scubakevdm is correct; bringing the heels closer to, or moving them further from, the bottom of the tank (more or less knee bend) will adjust your trim. I recommend practicing and watching body posture before tinkering with weight. Good technique is the first, best solution. Head up & back, lower back slightly arched, butt tight, and knees up. ;-)