Hirsch Heavy Calf black 20mm — waterproof leather watch strap

20mm waterproof leather watch strap, the most requested

The 20mm Heavy Calf leather watch strap in black with contrasting white stitching is a fully impermeable leather, certified 100 m water-resistant. 20mm is the most requested width of the model: divers, chronographs, sporting three-handers. It is the model that lets you keep leather on the wrist without removing it before water.

The Oysterglove Supersoft lining

Under the calf, the Hirsch Oysterglove Supersoft lining wraps the wrist from the first fitting. Supple and treated to last, it is impermeable like the upper leather and bonded to it by edge-folding.

Tool-free fitting

The tool-free Hirsch Quick Release spring-bar system changes the strap in two presses, with no trip to a watchmaker.

Waterproof leather, 100 m version

Hirsch developed this tanning with an Italian tannery: the calfskin is made impermeable through its thickness, not by a surface varnish that would eventually flake. Certified 100 m water-resistant.

Our pairing suggestions

The whole width is in our Hirsch 20mm straps. The other Heavy Calf straps: Heavy Calf black 18mm, Heavy Calf black 22mm. In Breitling blue, the Heavy Calf blue 18mm completes the range. For a sports leather over a rubber core, see the Hirsch George leather and rubber, and for full rubber the Hirsch Pure. Fitting is shown in our video guide.

Technical specifications

• Lug width: 20mm
• Material: black calfskin, hydrophobic tanning
• Water resistance: waterproof, certified 100 m water-resistant
• Lining: Hirsch Oysterglove Supersoft, impermeable
• Construction: Hirsch edge-folding, leather and lining bonded
• Stitching: contrasting white
• Length: standard L (200mm)
• Buckle: nickel-free hypoallergenic steel, 18mm, included
• Attachment: tool-free Hirsch Quick Release spring-bar system
• Origin: Austria