I use Fox Pivot knee armor underneath cordura trousers. They have a hard plastic vented exterior with padding underneath. The internal padding layout is designed to allow some airflow through the vents. The top of the armor is hinged, ensuring your knee is fully protected when your leg is bent and the padded hinge-mount protects part of each side of the knee. I live near the equator in Africa they seem to offer very good protection without being too suffocating in hot weather. I’m a firm believer in knee protection having once cracked a kneecap while bicycling (curb) and recently witnessed a pillion passenger hit his knee on the edge of an opening car door.
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