I cannot fathom how a horse deals with a heavy blanket on them over the summer months - oh my gosh, talk about heat stroke. How uncomfortable.
As I said, I don't rug unless I have to. Horses are much happier being left alone if they don't need human assistance, and most of the time, people think that because they are cold, their horses must be as well - which is garbage.
We as people, have a bad habit of humanizing our animals and putting human emotions on them. Just because we feel something, doesn't mean our animals are.
Here in new zealand, its is believed, that what we have bred out of horses(storng hooves in some cases, thick winter coat etc) we have to replace with human made things, i.e. shoes and covers for winter, and as I said beofre,the same thing goes for summer, your welcome to come see charli in the summer, he never overheats, infact white reflects the sun, its a VERY thin cotton sheet like so
they weigh like nothing, could pick one up with my pinky haha