Breathable Active Insulation with OCTA® 100 The Khamsin Lite Pants are insulated with OCTA® 100, a highly breathable synthetic insulation developed for fast-moving mountain activities. Its unique hollow-core fibre construction traps warmth while allowing excess heat and moisture to escape, helping regulate your temperature as your effort levels change. Unlike traditional insulated trousers that can quickly become too warm, the Khamsin Lite keeps you comfortable during steep ascents, technical scrambles and exposed ridgelines without feeling bulky. It’s an ideal solution for winter hikers, climbers and fastpackers who need warmth that works with them, not against them.
What are the Khamsin Lite Pants?
The Montane Khamsin Lite Pants are lightweight, breathable, insulated trousers built for moving fast in cold climates, when you'd overheat in heavier trousers.
Designed for hikers, climbers and trail runners, they offer a balance of breathable warmth and freedom of movement. The softshell outer provides weather resistance while the OCTA® insulation provides breathable warmth and helps regulate temperature as your effort levels change.
They're particularly well suited to high-output mountain days, whether you're climbing steadily uphill, moving across exposed terrain or simply trying to stay comfortable around camp in cold, changeable conditions.
Materials & Technology
AEROFYLTE Lite WR Softshell Fabric
The outer of the trousers are made from Montane's AEROFYLTE Lite WR fabric, which is a lightweight two-way stretch softshell material designed to balance durability, breathability and weather resistance. It's made from a combination of recycled nylon with elastane, in a tightly woven plain weave structure, that provides excellent levels of abrasion resistance and durability while remaining flexible and comfortable during movement. The material meets both Oeko-Tex® and Bluesign® certification standards.
The fabric is finished with a non-fluorocarbon DWR (durable water repellent) coating that encourages light rain or snow to bead off the fabric, without the use of harmful forever chemicals. However, please note this does not make the trousers waterproof.
OCTA® 100 Insulation
The trousers are lined with OCTA® 100 insulation, a lightweight, hi-loft synthetic fleece insulation designed for breathable warmth when moving fast on the trail. OCTA® 100 is made from 100% recycled polyester and uses a unique fibre construction with a distinctive cross-section with eight projections aligned in a radial pattern, surrounding a hollow fibre. Its innovative construction makes the fabric super light, quick drying, highly breathable and extremely warm, to help regulate temperature during intense activity while maintaining warmth in colder conditions without overheating. This innovative insulation also meets Oeko-Tex® certification standards.
Features and Functionality
Breathable Insulated Construction
The combination of a breathable, lightweight softshell outer and OCTA® insulation allows the trousers to keep you warm, whilst regulating your temperature effectively. This helps to prevent you from overheating during on steep sections of trail or when you’re moving fast, whilst still providing ample warmth for cold exposed routes or when activity levels drop.
Stretch Fit for Unrestricted Movement
The trousers' two-way stretch fabric and tapered leg shape allow freedom of movement for a wide range of activities, such as hiking, trekking, scrambling or setting up camp, where mobility is key.
Low-Profile Waistband with Adjustment
A pre-elasticated waistband with drawcord adjustment provides a secure and comfortable fit, preventing the trousers from digging in when bending down and stretching. The waistband's low-bulk design sits comfortably under a harness or backpack hip belt to prevent discomfort when worn for long periods.
Practical Pocket Layout
For storage, you'll find two zipped hand pockets that offer easily accessible storage for your trail essentials. There is also a concealed zipped thigh pocket, ideal for keeping smaller items close to hand, such as a mobile phone, snacks or energy gels.
Lightweight, Packable Design
Although the Khamsin Lite Pants are technically insulated trousers, they're surprisingly lightweight, low-bulk and packable, making them ideal to carry as part of your layering system, whether hiking, trekking, wild camping or hut to hut adventuring in cold climates.
Key Features
- AEROFYLTE Lite WR lightweight stretch softshell outer fabric
- OCTA® 100 breathable synthetic insulation
- Outer fabric made from 94% recycled nylon
- Insulation made from 100% recycled polyester
- High air permeability for active use (<20 CFM)
- Non-fluorocarbon durable water repellent (DWR) finish
- Bluesign® and Oeko-Tex® approved fabrics
- Elasticated waistband with drawcord adjustment
- Two zipped hand pockets
- Concealed zipped thigh pocket
- Regular fit with tapered leg
How do the Khamsin Lite Pants fit?
The Khamsin Lite Pants feature Montane's regular fit, designed to sit close enough to the body for optimal thermal efficiency, yet still provide ample space for layering over hiking trousers, merino baselayers or leggings. Their tapered leg provides a streamlined profile that reduces bulk and improves mobility during mountain activities.
What are the Khamsin Lite Pants best for?
- Winter hiking and hillwalking
- Mountaineering and alpine climbing
- Cold-weather trekking
- Winter hut-to-hut adventuring
- Fastpacking and multi-day mountain running
- Breathable insulated legwear for layering systems
Stretch Softshell Protection for Mountain Movement Built with AEROFYLTE Lite softshell fabric, the Khamsin Lite Pants combine lightweight weather resistance with outstanding freedom of movement. The two-way stretch fabric moves naturally with your body whether you're stepping over rocky terrain, scrambling or setting up camp. A tightly woven construction provides excellent abrasion resistance and helps block cold winds, while a PFC-free DWR treatment sheds light rain and snow. The result is a highly versatile outdoor trouser that performs in cold, changeable conditions without sacrificing comfort or mobility.
Low-Bulk Design for Layering & Fastpacking Despite being insulated, the Khamsin Lite Pants remain impressively lightweight and packable, making them easy to carry as part of a winter layering system. Their regular fit with a tapered leg provides enough room to wear over baselayers or lightweight hiking trousers while maintaining a streamlined profile that reduces excess bulk. A low-profile elasticated waistband with drawcord adjustment sits comfortably beneath a backpack hip belt or climbing harness, making the trousers particularly well-suited to fastpacking, winter trekking and alpine adventures where efficient layering is essential.
Mountain-Focused Simplicity The Khamsin Lite Pants focus on the features that matter most when you're moving quickly through cold mountain terrain. Every detail has been considered to create an insulated trouser that disappears into the background, allowing you to focus entirely on the terrain ahead rather than the kit you're wearing.
FAQ
What are the Montane Khamsin Lite Pants designed for?
The Khamsin Lite Pants are designed for winter hiking, mountaineering, fastpacking, alpine climbing, and cold-weather trekking, providing breathable insulation for a wide range of mountain activities.
Are the Montane Khamsin Lite Pants waterproof?
No. The Khamsin Lite Pants are not waterproof, but they are treated with a PFC-free DWR finish that repels light rain and snow while remaining highly breathable, allowing you to dodge quick showers.
What insulation do the Khamsin Lite Pants use?
The trousers are insulated with OCTA® 100 synthetic insulation, which provides lightweight warmth, excellent breathability and fast drying performance for active use in cold conditions.
Can you wear the Khamsin Lite Pants over hiking trousers?
Yes. Their regular fit is designed to layer comfortably over baselayers, leggings or lightweight hiking trousers, making them ideal as part of your winter layering system.
Are the Montane Khamsin Lite Pants good for winter hiking?
Yes. They provide an excellent balance of warmth, breathability and freedom of movement, making them ideal for winter hiking, hillwalking and various other cold-weather adventures.
Do the Montane Khamsin Lite Pants have pockets?
Yes. The trousers feature a concealed zipped thigh pocket, providing secure storage for essentials such as your phone, snacks or energy gels while keeping the design streamlined.