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White stitching against a semi matte black surface gives the Heavy Calf a direct, utilitarian tone. The generous padding and broad stance suit pilot watches, field watches, and brushed steel sports cases where legibility and contrast matter. On black dial tool watches with Arabic numerals or stark minute tracks, the stitching creates a clear frame around the case. Heavy Calf also holds its own against larger dive cases and chronographs.
Full grain calf leather with reinforced Coupé Franc edges.
The strap is made from hard wearing, full grain Italian calfskin with a dense fiber structure that resists scratches and daily wear. It is generously padded, giving it substantial body and a firm hand. The edges are painted and finished using Hirsch’s Coupé Franc construction, a rembordéd edge sealed with three layers of hand applied lacquer for added durability. The surface has a semi matte sheen that limits reflection. The underside is lined with Hirsch Oysterglove Supersoft leather, which is hypoallergenic and designed for long term comfort against the skin.
Thickness: approx. 6.8mm→3.0mm (measured at lug end, tapering toward buckle)
Padding: Generously padded
Lining: Leather
Edges: Painted
Stitching: White
Sheen: Semi-matte
Buckle: Polished stainless steel
Taper by size:
Spring bars: Quick release
Apple Watch: 22mm fits Apple Watch (with strap adapters).
Padded leather straps wear with a fuller, more structured feel that gives the watch added presence on the wrist. The layered construction creates a rounded profile at the case while remaining smooth and comfortable against the skin.
The two-piece layout keeps the watch centered and supported, with the padding tapering away toward the buckle so the strap does not feel bulky once fastened. After settling, the strap maintains its shape and position, favoring a stable, refined fit over flexibility or drape.
Hirsch length labeling: Hirsch uses M for Short length and L for Regular length on product packaging.
Length & wrist size:
120mm / 80mm (fits wrists approx. 6.75–7.75in)
Measurements exclude the buckle.
Clean with a soft, slightly damp cloth. Do not use cleaning products, including leather cleaners. For heavier soiling, the strap may be briefly rinsed under running water. Avoid soaking or prolonged exposure to water. Dry with a soft cotton cloth or allow to air dry at room temperature. If the strap becomes damp from perspiration or heat, gently wipe with a dry, soft cloth.
Hirsch is a family-owned Austrian watch strap manufacturer headquartered in Klagenfurt, with roots in leatherworking dating back to the 18th century. The company is widely recognized for combining traditional craftsmanship with technical innovation.
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Independent watch strap specialist since 2007