For those who might not be aware of the benefits; since I started using a rubber weight belt it has become a piece of gear I don't want to dive without. Here's a comparison of some rubber belts on the market.
I've examined various rubber belts in dive shops and got some idea of how they might perform but have personally used two so far, the Rob Allen and a no name brand.
The Rob Allen belt is made of a rubber material that is different to all other rubber belts that I’ve seen. The best way I can describe it is that it is somewhere between rubber and plastic. It stretches but not as much as other rubber belts and it is stiffer because of it, which is good. This allows the weights to not sag away from the body so much. The down side is that the RA material being stiffer cracks at stress points where normal rubber belts would never crack and does so relatively fast. No complaints whatsoever about the Buckle. The quick release function works perfectly. The width is 5.0cm and the thickness is 0.50cm.
This no name belt is available from leisurepro for $22 http://www.leisurepro.com/Prod/Categ...B45.html?Hit=1 The buckle is a PITA. When you close it tends to pinch your skin or wetsuit. The quick release function works fine. Changing weights is a big PITA because of the way the rubber belt needs to be threaded into the buckle. Once it is threaded there is no slack hanging out of the buckle. So if you miscalculated the length you need you have to do it over again. The rubber however is decent quality. Very durable and a nice balance between stretch and stiffness. At this price it's worth to buy the belt just for the rubber. Dimensions are 5.1cm by 0.30cm.
As a BTW I heard that truck tire inner tubes have rubber that may be suitable to make a belt.
Here are some other belts on the market you might want to comment on.
Omer Marsellaise belt.
Sporasub Marsellaise belt.
Cressi Marsellaise belt.
Spetton Marsellaise belt.