Registered Forum User
 Big Twin
     Posts: 1,993
 Join Date: Jun 2001
 Location: Herts
 Mood: Channel Swim is now a (bad) memory not a dream
  
    
     Could be the helmet. All heads are different shapes and all manufacturers make different shaped helmets eg, my head fits nicely into an Arai, (luckily), but not into some others. If you have a 'long' head, as if you've pushed your ears together, your chin/mouth/nose may be too close to the chin bar/visor. Try another helmet type for size in a shop and you may find the visor is further away from your breath and hence less chance of fogging up. Vents is another possibility. Some work a bit, some don't at all. 
 
 WeeJohnyB