Knee pads for mixed terrain

Hey, I'm struggling to find the right knee pad. Here's my criteria:

• Mostly for off-road, gravel tracks, woodland tracks, grass.
• Some road, but not racing around like a nutter.
• Not giant skate park pads.
• Easy to put on/take off over trousers
• Decent protection for my 40yr old knees
• Comfy (obviously)
• Price not an issue

Thoughts welcome and appreciated! :)