When it comes to performance fabrics, Merino wool is a freak of nature. A natural, surprisingly soft fiber that stays warm even when drenched with sweat, it also resists odor without washing for longer than you can bear to imagine. Trust us, we’ve tested the limits – once tasking our employees to run in our Merino blend for weeks over a New England summer. We use Merino wool in products across the training spectrum – from breathable mid-layers for long runs, to tees and tanks for workouts.