Knickerbocker - Transit PrimaLoft® Fill Jacket Black

The Knickerbocker Transit PrimaLoft® Fill Jacket was designed around versatility, sitting comfortably between a lightweight insulated jacket and a technical mid-layer. Finished in Black, it is warm enough to wear on its own through milder weather while remaining low-profile enough to layer beneath a heavier coat when temperatures drop.

The shell is made from 100% nylon ripstop woven in Italy by Olmetex. Ripstop reinforcement gives the lightweight fabric additional resistance against tearing without adding unnecessary weight, keeping the Transit easy to layer while still feeling durable enough for regular use.

Inside, the jacket uses PrimaLoft® insulation in a quilted construction. Originally developed as a lightweight synthetic alternative to down, PrimaLoft® is designed to trap warmth efficiently without the bulk associated with heavier insulation. That balance is what makes the Transit particularly useful as a mid-layer, adding warmth while still allowing comfortable movement underneath outerwear.

Knickerbocker also considered how the pockets would function when another jacket is worn over top. Double-layer chest pockets remain easy to access beneath a shell, effectively functioning like internal storage when layered. The inner chest compartment is secured with a custom YKK VISLON® zipper, while side-entry waist pockets keep the exterior practical when the Transit is worn on its own.

The front closes with a custom Knickerbocker-developed two-way YKK VISLON® zipper finished with a leather puller. The zipper system is designed to remain functional in colder conditions, while the two-way construction allows the hem to be opened from below when sitting or when additional ventilation is needed.

Elasticated brushed binding at the collar and sleeve openings helps retain warmth without adding bulky ribbing. An adjustable hem uses a rubberized cord lock, allowing the lower opening to be tightened when extra insulation is needed or left more relaxed for everyday wear.

Finished in Black, the technical materials and pared-back detailing keep the Transit understated enough to work alongside denim, workwear and more tailored outerwear. It is a straightforward insulated layer built around warmth, movement and easy layering rather than excess bulk.

Made in Portugal.

Key Features

• 100% nylon ripstop shell

• Shell fabric woven in Italy by Olmetex

• PrimaLoft® synthetic insulation

• Quilted insulated construction

• 100% nylon lining

• Lining woven in Italy

• Lightweight warmth without excessive bulk

• Designed to work as a mid-layer or standalone jacket

• Relaxed fit

• Custom two-way YKK VISLON® front zipper

• Leather zipper puller

• Cold-resistant zipper construction

• Double-layer chest pockets

• Interior chest pocket with YKK VISLON® zipper

• Side-entry waist pockets

• Elasticated brushed collar binding

• Elasticated brushed sleeve binding

• Adjustable hem

• Rubberized hem cord lock

• Black colourway

• Made in Portugal

• Transit PrimaLoft® Fill Jacket

• Shop more styles from Knickerbocker

Fabric & Care

100% nylon ripstop shell with PrimaLoft® synthetic insulation and a 100% nylon lining.

The Italian ripstop shell keeps the jacket lightweight while adding reinforcement against tearing. PrimaLoft® insulation provides warmth with relatively little bulk, making the Transit especially useful for layering beneath heavier outerwear.

Machine wash cold and air dry.

Avoid high heat when washing or drying to help preserve the insulation, shell fabric and technical components.

Fit

Relaxed fit designed with layering in mind.

The Transit provides enough room for comfortable movement and light layers underneath without becoming excessively bulky. Its relatively low-profile insulated construction also allows it to sit comfortably beneath larger coats and shells.

Take your normal Knickerbocker size for the intended fit. We recommend comparing the listed garment measurements against a lightweight jacket or mid-layer you already own and like the fit of before choosing your size.

Garment measurements taken flat before wash. Compare against a piece you already own and love.

How we measure

Canada: free Standard shipping over $300 CAD, otherwise $19.99 in BC and $24.99 to the rest of Canada. Express is $33 flat. Tracked courier, 1 to 4 business days.

United States: free Standard shipping over $350 USD, otherwise $25.99 USD. Express is $30 USD.

Returns: read our Return Policy for full details on returns and exchanges.