Giro Hex for me. Very comfortable and I can honestly say I forget it's there. I like having the adjustable cradle to help secure it.
Definitely go and try some first though.
When I was younger I only used to wear a helmet if I was out doing proper riding in my proper kit. Thankfully I was doing that when I managed to launch myself over the bars
, as the first thing to contact with the road was the front of my head. I was wearing a Giro Hammerhead and it did a fantastic job. At the time Giro even used to replace the helmet for free if you sent them your old one so they could do some tests on it. Don't think they do that now though (certainly wasn't anything in with my Hex saying they do it).
I still hate seeing little kids riding bikes with the helmet perched on the back of their heads and the straps so loose they're ready to choke them if they fall off
1993 Dyna-Tech MT4 frame with Shimano Deore XT/DX components.
2008 Orange Prestige S