Keeping your knees stabilized is essential when it comes to lifting. KneeCaps are specifically designed to provide compression, warmth and lateral stability when performing functional movements such as dead lifts, pistols and squats.Unlike other supports, KneeCaps are extra tall and designed to compress the VMO at its insertion point above the patella to help ensure proper stability and tracking. KneeCaps also provide compression and warmth to promote blood flow.5mm vs. 7mmThe difference between the two is support. The 7mm KneeCaps offer more compression, warmth and stiffness. All of these contribute to more support.