Dirtyrider: I thought it was pretty easy to understand. Nevermind pal i think lAche has answered my question…Its as i thought a conventional bicycle helmet construction.
The TLD is a EPS core with a very thin Polycarbonate shell vacuum formed on top. E.g Just like all ‘normal’ mtb helmets.
The Urge i believe is more like a ‘normal’ Full face MTB helmet or Motorcycle helmet, it also has the EPS Core but has a hard shell that is around 1mm thick, normally made of a composite or plastic (thicker polycarbonate?).
I personally MUCH prefer a hard shell helmet, i find that ‘normal’ mtb ones wear much quicker. I recently took a sizeable dig out of my Fox Flux from where a branch hit the helmet when riding through a tight section of trail. If i had been wearing my hard shell full face this would simply have bounced off and not stuck in the exposed soft EPS part.
Thanks for the input fellers.