not necessarily... just rider preference... it would probably get really hot though in the summertime... i used to just wear a jersey only... as we only had roost gaurds. those roost guards are made to deflect rocks coming at you at warp speed, not necessarily keep you from breaking a rib.
what I am looking for these days is rib protection which lead me to the bionic 2 thing. Reviews say it breathes well in the summer. It is my impression and from questions I've asked, that roosts don't do crap for your ribs. 
Well, oddly enough,
As for the collar bone, I wear a neck brace and the way it was explained to me was the point was to transfer energy from your neck and snap the collar bone instead, that being better than a broken neck.
on the neck brace. My brother wears one of those too when he plans to play Top Gun off the doubles...
might want to look at a kidney belt too...
... the true outdoor MX tracks are favorites. Not that WannaBeSupercross stuff...
if you can find them anymore... last one i visited was about 14-15 years ago in Indiana...
exactlyYou're talking about tracks where the only time you leave the ground is when you ####ed up as opposed to the modern idea of only being on the ground long enough to pre load the suspension?
yeah I think the common terms is called "old school" nowadays...
exactly
call it what you will...
I think my dad's preferences have rubbed off on me though. That's the style track he grew up to... euro style... GP... whatever...
I think those style tracks would make a comeback in a lot of places...