Neoprene Knee Sleeve

My son spends a lot of time on his feet at work and he has one knee that really hurts him at times. It gets so painful for him that it is hard to continue working and that doesn't work well for what he does. I have mentioned to him before that he should consider looking into purchasing a neoprene knee sleeve. I think it would help support his knee and would prevent it from hurting so much.