Spetton Rubber Belt
I bought two of these belts for mates who wanted rubber belts like mine. Mine is a Cressi rubber belt which is very good but apparently no longer in stock on this site. These Spetton rubber belts are sheeeet. Really bad. THe rubber is very thin and if you put any weights on it it bounces as you walk down the beach - very thin and poor quality. Avoid. My mate spent £2 on a length of non-aerated neoprene from a sealant shop and uses that. It is much better and more like my Cressi belt.
The belt would not grip on itself, every time you try and tighten it as you need to when freediving the rubber would slip through the buckle from both ends. The rubber is thin and very stretchable which is ideal for freediving better than a lot of belts but the buckle is ineffective.