Fill power measures how many cubic inches one ounce of down occupies, higher numbers mean more loft and better insulation per unit of weight. At 530 fill power, the Bridger sits in the mid-performance range: noticeably warmer than vest liners and entry-level puffers, appropriate for temperatures in the 30–50°F range as a standalone layer, and effective as a mid-layer in colder conditions.

Yes, full-grain lambskin, which is the highest-quality cut of genuine leather. Full-grain retains the natural grain structure of the hide, making it more durable and more breathable than corrected or split-grain leather. The 1 oz. weight specification means it's a thin, lightweight cut , optimized for mobility and layering rather than bulk.

Q: What is the difference between lambskin and cowhide for a vest like this?
Lambskin is significantly lighter and softer than cowhide, which makes it the right choice for a vest designed to be worn over other layers without restricting movement. Cowhide is tougher and better for hard-use outerwear. Lambskin is the preferred material when the goal is a refined, close-to-body feel which is why it's used in higher-end leather outerwear like this vest.

The Bridger is cut slim through the chest and torso. If you're wearing it over a t-shirt or dress shirt, your normal size will fit cleanly. If you plan to layer it over a sweater, hoodie, or thick flannel, which is the most common use case, size up one. The cinch toggles at the hem let you dial in the fit once you're layered.

YKK is the industry's most widely trusted zipper manufacturer, used across premium outerwear brands because their zippers are engineered for thousands of open-close cycles without binding, separating, or corroding. The antique brass finish on the Bridger's zippers adds an aged, heritage aesthetic that complements the lambskin grain and unlike chrome or painted hardware, brass patinas rather than flaking over time.