My son learned to uni at the age of 9 last year and has recently been hitting some basic fireroad dirt. We put a knobby tire on his 20" Avnir uni to Muni-fy it 
Since I broke my hand falling off my muni about a month ago, he’s been a bit nervous to ride dirt. It’s hard enough to shop this stuff for adult sizes. Are there any decent sets of pads and/or armor to fit a 10-year-old?