Lovely warm showers are a thing of the past for me now, I've been having coldies for a month now and they feel GREAT. Not the cool water itself of course but the feeling I get after. They are full of health benefits and thats espesially if your a man (seriously) they also give you an extra sense of acheivement but it's good for hair as well!! Heat in general is potentially damaging for hair making it brittle so it's a good idea to not go too hot, anyway, but i've found that my hair is shinier after regular cold washes. Heat makes things expand whilst cold of course makes them contract, this will contribute to stronger hair. I'll also add, i don't know if it's just me but it seems my hair seems to dry quicker after cold rinses.