It is true that coat of CO is there to keep them isolated from sun too, but you just can not compare summers on Caucasus (or Norway) and on Bahamas. Summers on Caucasus can be very hot but don't forget that during summer nights temperature can be freezing, and that's not even close to place where our friend Bahamian lives, especially when you consider that there is almost no change in temperature during whole year, and there is very little difference in temperature during day and during the night. Not even to mention Caucasus winters, and CO is made for them.