Most comfortable, least annoying, and silliest-looking kneepads I've used: RoboCap : r/Tools
Getting your knees dirty – Dirty Nomad
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Amazon.com : Fancy Daisy Knee Pads for Kids Unicorn Knee Pads and Elbow Pads Set with Drawstring Bag Wrist Guards for Roller Skating Skateboard Protective Gear Set for 3-8 Years Old Boys