The Speardiver Marseilles rubber weight belt is now available. These rubber belts are very good, as a matter of fact they're the best I've seen.
What I consider a good quality in a rubber weight belt is a correct flexibility versus stiffness ratio. The rubber of a Rob Allen belt for example is too stiff and plastic like. It holds weights very firmly against the body (the weights don't sag), but it's not at all flexible, and when tightened to the point of staying put doesn't allow the expanding torso to stretch it when breathing in. The rubber of an omer weight belt on the other hand is too soft, it stretches well to fit your body and expands with breathing, but it's not stiff enough and the weights pull the belt away from the body. I guarantee that the Speardiver belt rubber is ideal in stiffness and flexibility. The belt can be tightened so the weights stay put, and comfort is maintained.
The belts are Marseilles style, which basically means that the buckle is like a typical belt buckle, manufactured in nickel coated brass ideal for use in a marine environment. For those who may not be aware a Marseilles style belt is a safest quick release belt, one pull on the loose belt end and buckle springs open releasing the belt, which smoothly runs out of the buckle by the action of the roller.
The advantages of a rubber belt for a freediving spearo is that it can be tightened to the point of not sliding up and down the torso during descents and ascents, due to the repeated compression and expansion cycles of our wetsuit and body. And it doesn't impede breathing because it's flexible and stretches with the expanding torso. Anyone who tried diving with a rubber belt will never go back to nylon webbing.
Specs:
Thickness 0.2" (5mm)
Width 1.9" (4.9cm)
Length 62" (157.5cm)
Number of holes 15
Spacing between holes 1.77" (4.5cm)