A simple neoprene heat retainer will not usually have any additional springs, stays or supports. Some are open patella and have a hole for the patella to fit through. This can decreases the pressure on the kneecap or patella. A padded knee support will be closed and have additional padding over the patella to protect from knocks or minor impact as well as pressure from the ground when kneeling for long periods or landing on the knees for example in volleyball.

Use a knee support for helping to get better and protecting from injury but do not rely on it indefinitely. By wearing it too long your muscles may weaken as they will not be needed as much. If unsure always seek professional advice and use a support as part of an overall rehabilitation programme.
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