Secure your watch from sand, dirt, water, paint, tomatoes and knocks with the watertight SEVENFRIDAY Heavy-Duty Box (HDB) Free from convention, SEVENFRIDAY presents its first watch accessory, the Heavy-Duty Box. A playful and ironic answer to the constant competition between watch brands for more functions and smarter applications. This airtight box is made from nylon fibre and is designed to take a beating, protecting your SEVENFRIDAY from sand, snow, sea and skydives! When the going gets tough, the HDB has your back #destresstest NB - HDB fits all P-Series watches and non NFC M-Series watches.