Horse Hair shaving brushes fall between boar bristle and badger on the shaving brush scale: They're much softer than boar and have better water retention, but aren't quite at that badger level.
One thing Horse Hair offers that the other two don't is that it's cruelty-free. Woo hoo!
This brush is slightly longer than average and features a metal and olivewood handle. All in all it's a very attractive brush at a terrific price point!