Every 4-6 weeks I tweak my back doing back squats. It's never an injury severe enough to make me miss training, but it's serious enough to bug for a week of two while it heals up. I've tried everything to stop this from happening: changing my form, tightening my belt REALLY tight, squating slower.... nothing seemed to stop it. A few weeks ago I had to order a different weightlifting belt. The one i had been using the last couple years wasn't legal in powerlifting meets. Bada Bing bada bang, problem fixed! Turns out I was needing a different weightlifting belt. The one I'm using now gives my back perfect support! I haven't had any problems at all since lifting with the new belt. It's an Ader 4 inch weightlifting belt. Its a miracle worker and a back saver!
There's a funny 105k+ story to go along with this belt. I ordered the belt based on their sizing chart. When I got it in the mail I thought they had to have sent me the wrong sized belt because this sucker was huge! I'm sure it would fit around two normal sized men twice with plenty of room to spare. I started packing it in the box to return it and my wife said, "why don't you try it on so you know how much smaller of a belt you'll need to replace it with." Great idea! I tried it on, not only did it fit, but if I was a half inch bigger around the belt would be to small. Ah, the life of a super heavy weight. Every day in the shoes of a 105k+ is an adventure!