Hi I tried both these on and they both fitted me well (yes if you saw my previous post that my feet were too wide according to LBS I foudn out he was wrong!) I was wondering which would you choose if they both fitted comfortably? Louis Garneau has some weird climax system which keeps you cool in all weather? the Sidi's are known to last forever but would the LOuis Garneau last just as long? or equal? My LBS suggested that the Carbon Air was basicaly the same but just cheaper compared to the sidi. Personally I hadn't heard of them until yesterday haha so I dont' know much about them.