The Ocean Hunter Marseille rubber weight belt is a extremely flexible rubber which adjusts to wetsuit compression at depth, ensuring that the buckle does not slip around the body.
The roller buckle will always release on demand however will not open when knocked. Wearing a weight belt will give you that little extra help to dive below the buoyancy level, depending on what you weigh is how you determine how much weight you need. Being made from rubber, this will not twist or move when diving which will make it more comfortable for the duration.