Western Mountaineering Puma MF Sleeping Bag - -32°C Expedition Down Bag (850+ Fill Power)

Expedition Warmth. Uncompromising Performance.

The Western Mountaineering Puma MF is a true expedition-grade sleeping bag built for the harshest cold-weather environments.

With an incredible 9.5" (24cm) of loft and packed with 850+ fill power goose down, this bag delivers extreme warmth down to -32°C, making it ideal for high-altitude climbing, winter expeditions, and extreme alpine conditions.

Advanced construction features like V-Block side baffles, interlocking draft tubes, and a fully insulated collarensure maximum heat retention and down control-keeping you warm even in the most demanding environments.

Why You'll Love It

Extreme warmth - Rated to -32°C
Massive loft - 9.5" of insulation
850+ fill power down - Premium warmth-to-weight
Expedition-ready - Built for harsh conditions
Spacious fit - Room for layering

Built for Extreme Cold Expeditions

Perfect for:

Alpine expeditions
Winter mountaineering
High-altitude climbing
Arctic conditions
Cold-weather bivouacs

Designed for when warmth is non-negotiable

Performance Features

Extreme Cold Protection (-32°C)

Expedition-level insulation

Keeps you:

Warm in sub-zero environments
Protected in extreme conditions
Comfortable during long nights

850+ Fill Power Goose Down

Premium insulation

Provides:

Maximum warmth-to-weight ratio
High loft retention
Long-term performance

V-Block Side Baffle Construction

Advanced down control system

Improves:

Even insulation distribution
Heat retention
Cold spot prevention

Dual Interlocking Draft Tubes

Cold air sealing system

Helps:

Block cold air entry
Retain internal warmth
Increase thermal efficiency

Fully Insulated Draft Collar

Seals in body heat

Provides:

Additional warmth at the neck
Improved heat retention
Minimal heat loss

MicroLite XP™ Outer Shell

20D breathable, water-resistant fabric

Benefits:

Weather resistance
Improved breathability
Durability in harsh environments

Spacious Mummy Fit

Designed for layering

Allows:

Extra clothing inside
Better comfort in extreme cold
Freedom of movement

Technical Specifications

Temperature Rating: -32°C
Fill: 850+ Fill Power Goose Down
Loft: 24 cm (9.5")
Shell Fabric: 20D MicroLite XP™

Weights:
165cm: 1475g
180cm: 1560g
200cm: 1645g

Fill Weights:
165cm: 935g
180cm: 1020g
200cm: 1105g

Girth (Shoulder/Hip/Foot):
165cm: 157 / 140 / 99 cm
180cm: 163 / 142 / 99 cm
200cm: 168 / 145 / 99 cm

Packed Size:
165cm: 23 x 46 cm
180cm: 25 x 50 cm
200cm: 25 x 50 cm

Origin: USA

Includes:
Ultralight stuff sack
Breathable mesh storage bag

Perfect For

Expedition climbers
Winter mountaineers
Alpine climbers
Cold-weather adventurers
High-altitude expeditions