Is there a good Full Face trail helmet ? I run a TLD. It is light and fits great. The intake port on the mouth is key for keeping airflow smooth while pedaling up... Here is the problem it has a ventilation system. but, it sin't the best. I may keep it for DH and get a new trail helmet. But, which one ? What makes a good trail helmet ? I say a large intake port or ports coupled w/ good exaust vents (everywhere) and a removable liner ( you sweat if it is an actual trail ride) What's your take on FF trail helmets ?