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An ultralight, breathable insulated layer designed for fast, cold-weather movement where warmth and mobility must work in balance.
Montane says:
Protecting against biting winter winds, the lightweight Nylon ripstop outer fabric offers exceptionally lightweight all weather protection, whilst our APT highly breathable liner enhances comfort and ensures critical moisture management is maintained. Primaloft Gold Active Vent offers highly efficient warmth in all weather conditions, strategically mapped to focus warmth where you need it most and further reduce weight.
Our Verdict
At 185g (UK12), the Fortes Nano Insulated Pull-On uses 40 g/m² of PrimaLoft Gold Active Vent insulation, providing warmth while allowing heat to escape during exertion. The Barrier Tough 12D nylon outer adds wind resistance and light weather protection, finished with a PFAS-free DWR. Montane’s air-permeable liner helps manage moisture effectively when working hard.
The trim, articulated fit offers excellent mobility, and the self-sealing cuffs work neatly with gloves. A half-length zip allows quick venting, while the high chest pocket remains accessible when wearing a pack or harness.
Warmth is well judged for moving fast in cold conditions, and the mapped insulation prevents overheating under the arms. The build feels solid for such a light piece, though the fine fabric benefits from care on abrasive terrain. For fast, cold-weather activity where breathability and freedom of movement matter, the Fortes Nano is an excellent choice.
- Reviewed by Ultralight Outdoor Gear
Features
- Zoned insulation for core body warmth and protection
- Fleece side and under arm panels for comfort, excellent moisture management and freedom of movement
- Low profile seams throughout increase durability and comfort
- Low profile elasticated hood offers thermal protection when required
- Lightweight no.3 YKK VISLON® Natulon recycled front zip reduces weight
- Two YKK Natulon recycled zipped hand pockets
- Built on the Trim Fit block for a fit that allows for uninhibited comfort and performance whilst allowing for correct layering for active use
Specifications
- UK8 Weighs: 177g
- UK10 Weighs: 178g
- UK12 Weighs: 185g
- UK14 Weighs: 199g
- UK16 Weighs: 204g
Material & Construction
- Barrier Tough A densely woven mini-ripstop textile using super lightweight 12 Denier recycled nylon yarns, excellent abrasion resistance for its weight. PFC/PFAS FREE DWR.
- 40 g/m² PrimaLoft® Gold Insulation Active Vent PrimaLoft® Lightweight warmth and thermal efficiency, designed for breathability and effective moisture management. Packable insulation that remains warm even if wet. 4-way stretch enables freedom of movement.
- APT - Air Permeable Technology utilising a 10 denier recycled nylon ripstop fabric with engineered air permeability of 10cfm to maximise insulation warmth, efficiency and end-user comfort.
