Blanketing horses

From Mugwump
http://mugwumpchronicles.blogspot.com/2008/10/africa.html

Blankets. I hate them. They are a pain. I get their purpose. Once again, for our convenience. If we need to keep them clipped or under lights, they have to be blanketed.
Horses with healthy winter coats never need a blanket. The winter hair stands up and traps air and heat to warm the horse. Blankets flatten hair. So a horse with a winter coat is colder in a blanket than without it. I'm serious, ask your vet.
If we turn them out with dried sweat flattening their hair they'll get cold. Which is why I'm a big fan of coolers. And curry combs.
I will blanket a horse if they are sick. Clipped. Kept under lights. Extremely thin. That's about it.