I agree pretty much with ThisisOverload.
Seen dozen of high school athlete's squat well above the 400 mark for higher reps, back or front squat positions. All in average workouts, nothing special and no sleeves or wraps. .. Even some women lifters accomplish this also. All without any sleeve's, wraps or whatever, even for older lifters.
Some will use ballet leg/knee warmer before squats. And a few will use a heating lotion/cream before squatting. Bring heat to the area.
There is a old pro or con theory that wearing sleeves or wraps will only encourage weaker knees/elbows in the long run. The number one rule is to warmup, of course. (heard stories that a few Olympic lifters of the former eastern block countries could walk into a gym and rep out 500+squats with no warmup and still in street clothes...that's the story anyway)
Good Luck..