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.

SEVENFRIDAY Heavy-Duty Box Technical Details


Protective Seal

Carbon fibre inspired protective bezel

Heavy-Duty Box


Securing your SEVENFRIDAY from sand, dirt, water, paint, tomatoes and bumps

HDB Dimensions

72mm (W) x 67mm (L) x 32mm (H)

Heavy-Duty Box made of recyclable nylon material.

Latch handle


Secure closing system


Size: 28mm (W) x 41.5mm (L)

Nylon fiber and Velcro strap with 4 different adjustable lengths (fits over ski jackets and wet suits).



NFC technology chip integrated on the inner sponge for use with our Sevenfriday app

SEVENFRIDAY Heavy-Duty Box Design Highlights


Nylon Case

Rubber Adaptor

Airtight Latch

NFC Chip

Velcro Strap

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