The Walnut Boxcalf is a C&B staff favorite. This is a strap we're truly proud of. We used "box calf" leather, known for having virtually no stretch and great characteristics for a watch strap. The leather takes a few times of being worn to break in and mold to your wrist. Once it does, you won’t want to take it off. The Walnut Boxcalf strap will effortlessly take your favorite watch to the next level.