Montane's New Synthetic Insulation
Oct 01, 2026
Built for big climbs, wild views, and cold that doesn't stand a chance. Feather-light but seriously warm, they lock in heat without slowing you down and help you breathe when the pace picks up. From misty morning switchbacks to golden-hour ridgelines, these jackets move with you and keep you safe when the temperature drops and the adventure heats up.
''Insulation designed to excel in cold mountain environments.''
For both highly aerobic and start/stop activities during technical mountaineering pursuits, this adaptable mid-layer helps maintain a stable equilibrium within the user's layering system. Carefully positioned PRIMALOFT® Gold Insulation Active Vent and OCTA® 100 materials aid moisture management and thermoregulation ensuring you stay warm and dry when working hard.
Built-in stretch of the FEATHERLITE™ Stretch Air and PRIMALOFT® Gold Active Vent insulation provides unparalleled fit, maximising freedom of movement during dynamic activities. With an uncompromised technical climb feature set the Stratium Hoodie is designed to allow the wearer to excel in cold technical mountain environments.
FEATHERLITE™ Stretch Air
Nylon fabric engineered to maximise breathability, freedom of movement and comfort without sacrificing durability. Finsihed with a nonfluorocarbon water repellent.
REACH +
Reach + fit construction offers unparalleled arm lift and articulation for excellent movement and reach.
Low Profile Seams
Low profile seams throughout increase durability and comfort.
OCTA 100
The innovative structure of the fibres in the Octa 100 fleece lining means that it excels in efficient thermal and moisture management, to keep you warm without overheating. Octa fleece’s unique structure makes it quick-drying, breathable, lightweight, and extremely warm for its weight.
Elasticated Cuffs
Elasticated stretch fabric cuffs with integrated thumb loops for additional protection, keeping sleeves in position when reaching high.
Hood
Elasticated hood system for a lightweight, low-profile construction.
Chest Pockets
2x pack and harness compatible YKK NATULON® recycled zippedchest pockets.
PRIMALOFT® Gold Active Vent
PrimaLoft® Gold Active Vent insulation strategically uses microfibres for industry leading performance. Mapped to the front, shoulders and top of the arms, this insulation enables air flow and actively manages moisture by allowing water vapour to escape, to regulate body temperature for all day comfort. It's warm, durable, and soft, featuring 4-way stretch to allow a wider range of motion so you can move freely during any activity.
''The ultimate lightweight breathable thermal regulating hoodie.''
This ultimate lightweight and breathable thermal-regulating hoodie is designed for cold conditions. It features PRIMALOFT® Gold Active Vent insulation, which works in conjunction with our highly breathable FEATHERLITE™ Air fabric. This combination traps warmth, resists wind, and allows moisture to escape freely from the body.
The hoodie has zoned insulation, with 80g throughout the body for core warmth and protection. In areas such as under the arms, side panels, and hood, 60g of insulation is used to reduce bulk and increase comfort and freedom of movement.
Improved patterning, built-in pre-articulation, and the mechanical stretch of the FEATHERLITE™ Air fabric, combined with the 4-way stretch of the PRIMALOFT® Gold Active Vent insulation, ensure an uncompromised fit. This makes the hoodie an excellent mid-layer or standalone piece for active users in cold conditions.
FEATHERLITE™ Air
Mechanical stretch ripstop woven using fully dull 20 denier recycled nylon yarns. Developed for high wind resistance with exceptional breathability, providing outstanding comfort and uncompromised performance. A non-fluorocarbon water-repellent finish.
PRIMALOFT® Gold Active Vent
PrimaLoft® Gold Active Vent insulation strategically uses microfibres for industry leading performance. Enabling air flow and actively managing moisture by allowing water vapour to escape, to regulate body temperature for all day comfort. It's warm, durable, and soft, featuring 4-way stretch to allow a wider range of motion so you can move freely during any activity.
Adjustable Hood
Self-sealing hood system featuring a single-point rear adjustment for a precise fit.
Hand Warmer Pockets
2x pack and harness compatible YKK NATULON® recycled zipped hand pockets.
Elasticated Cuffs
Self sealing stretch fabric cuffs for comfort, warmth and fit.
Terms and Conditions
Enter to win a Montane Men's Sirocco XT Hoody or a Women’s Sirocco XT Hoody! Two hoodies are available to win, and each winner can select their preferred size and colour (subject to availability).
The competition starts on 1st October 2026 and ends on 1st October 2026. All entrants between these dates will be entered into the draw.
Two winners will be drawn on 2nd November 2026 and notified via email. If you don't get an email from us, unfortunately, you have not been successful on this occasion.
Every correct entry submitted between the competition dates will have their email address entered into the draw. The draw uses a random number generator and will be completely fair, with each email address having the same chance to win as any other. Only one entry per person will be accepted. No dialogue will be entered about the administration of the competition/draw.
You can also enter the draw by sending your entry to us by post at the following address: Ultralight Outdoor Gear, Unit 2, Tees Valley Court, Wynyard Business Park, Billingham, TS22 5FE, United Kingdom. Add your name, answer, and email address inside.
If you purchase one of the prize items and then win the competition, you are entitled to a refund of the cost of the item!
Built for big climbs, wild views, and cold that doesn't stand a chance. Feather-light but seriously warm, they lock in heat without slowing you down and help you breathe when the pace picks up. From misty morning switchbacks to golden-hour ridgelines, these jackets move with you and keep you safe when the temperature drops and the adventure heats up.