It really depends on how and what you lift. If you're lifting really heavy, I use a 12mm leather lever lock style for competition. It's easy to get on/off by yourself and still have it tight. Belts for heavy lifting should not be comfortable. They're tight and 12mm leather doesn't have any flex. After the lift, getting it off should be the first thought that you have.

That's what I use, but like I said, it depends on how and what you're really using it for. I'm sure others will give you some more good options and you can pick something that works for your style.
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