There are many horse breeds with long, flowing manes, no doubt. In fact, if you care for your horse’s mane properly, it might grow longer.
Gypsy Vanners did not get the height of their ancestors. However, they inherited their super long manes. Their manes are so long that it can take hours to groom them properly.
Beyond being beautiful, Haflinger horses have one of the thickest and longest manes of any horse breed. Of course, because of this, their grooming sessions are typically long.
Friesian horses are jet black with manes, tails, and feathers of similar color. Their manes and tails are thick and long, thanks to their pedigree of draft and riding horses.