Merino Wool and Bombas Performance Running: A match made in workout heaven. Why did we make them in a quarter-rise height? Because they’re an ideal rise, designed to prevent your socks from slipping down and to keep dirt out of your socks during trail running. Plus, Merino Wool is naturally soft, breathable, moisture wicking, and quick drying. It’s great to work out in on its own, but blend it with polyester and spandex (which we did), and you’ll get even more stretch and arch support, making it an all-workout-ready force to be reckoned with.