Coolers can be shaped like a regular fitted horse blanket, with chest straps, belly bands and leg straps. Or coolers, can be shaped like a big square bed sheet that is draped over the horse from ears to tail.
You can also use a cooler to protect your horse from the draft and keep dust of your while trailering. Or coolers can be used to add a bit of warmth in the stable. Coolers are also useful to prevent your horse from getting soiled after a bath. For these uses, you will want a fitted cooler with straps that will prevent shifting.