my son is getting good on his balance bike. he's coasting along now, but he's also crashed a couple times and skinned his knee. my wife insists on getting him knee pads. i reluctantly agreed, but stipulated that i get to pick them out. i've done some looking, one of the requirements is that they are NOT hard shell. MUST be youth size. The brands I've looked at so far: G-Form TLD Leatt These all look great, but are $50 and up. wondering if anyone knows of other options out there.