A coarse woven blanket cut to a horse’s back, laid under the saddle to spare the animal chafing or thrown over it at a standstill in cold weather. A horse worked hard and left standing wet will chill and stiffen, which is how a valuable animal is ruined by carelessness, so any rider who knows their business carries one.
Blanket, horse
Coarse woven blanket for a horse, under saddle or against the cold.