In fact, the brand has just reunited with another cult-favorite brand to drop the Undefeated x Timberland Field Boot GTX, a military-inspired reimagining of one of the brand’s best outdoor boots.

We tested insulated vests from Patagonia, On, Brooks, and more to find the best running vest to help you stay warm during cold-weather workouts.

REI's in-house products regularly over-perform their price tags and they're up to half-off during this flash sale.