But, my preference is a shreadready fullface for my kayak and a ball type helment for the canoe and raft.
Mine is a Head Trip "Daffy". This gives me good coverage in the front, back and sides.Mine is very comfortable too so I don't mind wearing it in the raft.
ShreadReady also have some nice looking styles like this.If money is no object the "Sweet" ball type is very sweet.
I've hit my head too many times (in a kayak) not to wear one on any class III/IV runs while rafting..