My 12 y/o son wears fox armor when learning new tricks on jumps over 30', he started last year after a good slam.... That's what makes him feel comfortable.... He takes them off when he can nail it 4/5 times. No knee or elbow though. I wear knee braces occasionally. I though about getting some mx style braces with protection..
Home page :: Asterisk Knee Protection I never got any though. I have beet hiking and mtn biking a lot this summer and my knee feels a lot better.....