Mounted search and rescue

["Patty Montoya" <riverrider@bak.rr.com>]

I have seriously thought of using a helmet, but my experience with a bicycle 
helmet was so bad about ten years ago, that I've never tried another one.  I 
had to add little rubber pads to make it fit right.  It was uncomfortable 
and slipped around on my head.  I wore it twice and that was it!!
Does anyone have a suggestion of a helmet brand/type/etc.?  Friends have 
suggested getting a helmet with ventilation, other friends have warned that 
branches can stick through the ventilation hole and knock you off the horse. 
(This almost happened to a friend of mine, but she was walking slow enough 
that she was able to back the horse up, take off the helmet, and unstick the 
branch.)
Thanks for any ideas,
Patty/CA