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Klättermusen Insulated Jacket Guide

Atle 3.0 and Rå jacket

Insulated Jacket Guide

Gear Guides

Finding the Right Insulated Jacket

Klättermusen insulated jackets are designed to provide the perfect balance of warmth, weight, packability, and durability. Whether you’re looking for lightweight insulation for active use or maximum warmth in extreme cold, the right jacket helps you stay comfortable in any conditions.


Choosing the right insulation can feel like a challenge, so we’ve created this guide to help you find the best option for your needs. To begin, ask yourself two key questions:


– What conditions will you primarily use it in?
– What level of warmth do you need?


Looking to understand how insulation fits into your full clothing system? See our Layering Guide.

Rå hood jacket
Bore 3.0
Lopt jacket close up

Insulation Explained

Insulation is what keeps you warm by trapping body heat, but different materials perform differently in varying environments. Understanding the difference between Down, Synthetic, and Hybrid insulation will help you choose the jacket best suited to your adventures.

Down

Provides the highest warmth-to-weight ratio and compresses small, making it ideal for cold, dry conditions or weight-sensitive adventures. Performance drops if it gets wet.
Perfect for: expeditions, cold and dry climates, weight-sensitive adventures.

Synthetic

Retains warmth even when damp and dries quickly, making it reliable in wet or variable conditions. Easier to care for than down.
Perfect for: wet or mixed conditions, all-round use, durability, easy care.

Hybrid

Combines down and synthetic for balanced performance, offering warmth, moisture resistance, and durability in a versatile package.
Perfect for: changing conditions, multi-day trips, balanced performance.

Atle 3.0 Jacket

Activity & Warmth Level

All our insulated jackets use the HCR (Heat Control Rating) system — a scale that measures the jacket’s insulation performance and warmth in different conditions. HCR ranges from 3–9, with 3 providing light insulation for high-output activities and 9 offering maximum warmth for extreme cold and harsh environments.

Light insulation, HCR 1-3

Ideal for high-output activities such as ski touring, climbing, or fast hiking. Breathable and flexible, designed to layer under a shell without overheating.
Perfect for: high-intensity activities, ski touring, climbing, fast trekking.

Medium Insulation, HCR 5

Balanced warmth for most outdoor adventures. Suitable for hiking, alpine skiing, and day trips in colder conditions. Combines comfort and versatility.
Perfect for: all-day hiking, alpine skiing, trekking, general outdoor use.

Heavy Insulation, HCR 7-9

Heavy insulation for extreme cold or demanding expeditions. Designed for harsh arctic conditions or extended periods outdoors, keeping you warm when you need it most.
Perfect for: arctic expeditions, high-altitude climbing, cold-weather camping, multi-day adventures.

Light insulation, HCR 1-3

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Jacket
HCR
Insulation
Fit
MFR
Weight (M's L)
Hood
Back Length (M's L)
Benefits
Pockets
Packable in Pocket
urd light stretch
Urd Light Stretch
3
PrimaLoft®
Regular
8
555g
Yes
76cm
Warm when damp
4
Yes
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Gondul
Gondul
1
PrimaLoft®
Regular
4
388g
Yes
74cm
Stretch side panels
3
No
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Drifa jacket
Drifa
1
PrimaLoft®
Regular
2
376g
Yes
74cm
Breathable insulated comfort
3
No
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Urd
Urd
3
PrimaLoft®
Regular
8
593g
Yes
76cm
Warm when damp
4
Yes
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Lopt zip
Lopt Zip
3
RDS-down
Regular
8
397g
No
78cm
Superior tear resistance
2
Yes
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Lopt Hood
Lopt Hood
3
RDS-down
Regular
8
435g
Yes
78cm
Superior tear resistance
2
Yes
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Alv
Alv
3
PrimaLoft®
Regular
8
415g
Yes
74,5cm
Warm when damp
2
Yes
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Alv 2.0
Alv 2.0
3
PrimaLoft®
Regular
8
361g
No
75cm
Warm when damp
2
Yes
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vale
Vale
3
PrimaLoft®
Regular
2
352g
Yes
72cm
Breathable & Quick-drying
2
No
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brokk
Brokk
3
RDS-down
Relaxed
8
377g
No
76cm
All-purpose usage
3
Yes
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Medium Insulation, HCR 5

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Jacket
HCR
Insulation
Fit
MFR
Weight (M's L)
Back Length (M's L)
Taped Seams
Pockets
Packable in Pocket
Lödyn
Lödyn
5
PrimaLoft®
Regular
8
804g
78cm
No
3
Yes
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atle 3.0
Atle 3.0
5
RDS-down
Regular
8
648g
78,5cm
No
3
Yes
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Bifrost
Bifrost
5
Re:down
Regular
10
630g
77cm
Yes
3
No
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Alfheim
Alfheim
5
PrimaLoft®
Regular
10
684g
99cm
No
5
No
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Heavy Insulation, HCR 7-9

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Jacket
HCR
Insulation
Fit
MFR
Weight (M's L)
Back Length (M's L)
Taped Seams
Safety Toggle for Closure
Pockets
Packable in Pocket
Extras
Benefit
rå jacket
7
RDS-down & PrimaLoft®
Regular
8
896g
87,5cm
No
No
3
Yes
Compressible
Superior thermal & lightweight
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Bore 3.0
Bore 3.0
7
RDS-down
Relaxed
8
962g
87,5cm
No
No
3
Yes
Compressible
Superior thermal & lightweight
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Nifelheim
Nifelheim
9
RDS-down
Relaxed
8
1198g
92,5cm
No
Yes
4
No
Warm when damp
Organic water resistant down
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Iving 2.0
Iving 2.0
9
RDS-down
Relaxed
10
1424g
96cm
Yes
Yes
4
No
Compass on sleeve
Wind- and waterproof construction
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Shop Down and Insulated Jackets