This is where I post products I personally use and highly recommend
I like using a belt when I go much over 70% of my max lift on deadlift and squat. The belt can help protect your lower back and allow you to lift heavier things with proper technique.
These are also helpful for your knees when squatting and doing weighted lunges. Just like the belt, when I'm going heavy ~70% of my max squat, I like to throw these on for safety and injury prevention.