The Benchmark 3-Season Sleeping Bag

The Western Mountaineering UltraLite is an award-winning, best-selling sleeping bag trusted by climbers and backpackers worldwide.

Designed for maximum efficiency, it combines an ultralight 12D ExtremeLite™ shell, a performance mummy cut, and 850+ fill power goose down to deliver reliable warmth down to -7°C-without unnecessary weight or bulk.

Whether you're tackling long-distance trails or heading out for a weekend adventure, the UltraLite offers the perfect balance of warmth, weight, and packability.

Why You'll Love It

True 3-season performance - Reliable down to -7°C
Ultralight - From ~820g total weight
850+ fill power down - Premium insulation
Compact pack size - Easy to carry
Proven design - Award-winning and best-selling

Built for Versatile Backcountry Use

Perfect for:

Backpacking
Thru-hiking
Alpine climbing
3-season camping
Multi-day adventures

Designed to perform across a wide range of conditions

Performance Features

3-Season Warmth (-7°C)

Reliable all-round performance

Keeps you:

Warm in spring, summer, and autumn
Prepared for cooler nights
Comfortable across varied terrain

850+ Fill Power Goose Down

Premium insulation

Provides:

Exceptional warmth-to-weight ratio
High compressibility
Long-lasting loft

Continuous Baffle System

Adaptive insulation control

Allows:

Shifting down for colder nights
Balancing warmth in milder weather
Greater versatility

Insulated Draft Tube + Collar

Heat retention system

Helps:

Block cold air
Seal in warmth
Improve thermal efficiency

ExtremeLite™ Shell (12D)

Ultralight, breathable fabric

Benefits:

Minimal weight
Excellent packability
Durability for its class

Efficient Mummy Cut

Performance-focused shape

Provides:

Faster heat retention
Reduced bulk
Lightweight efficiency

Technical Specifications

Temperature Rating: -7°C
Fill: 850+ Fill Power Goose Down
Loft: 14 cm (5.5")
Shell Fabric: 12D ripstop nylon (ExtremeLite™)

Weights:
165cm: 795g
180cm: 820g
200cm: 880g

Fill Weights:
165cm: 425g
180cm: 455g
200cm: 480g

Girth (Shoulder/Hip/Foot):
165cm: 150 / 130 / 97 cm
180cm: 150 / 130 / 97 cm
200cm: 152 / 132 / 97 cm

Packed Size:
All sizes: 18 x 33 cm

Origin: USA

Includes:
Ultralight stuff sack
Breathable mesh storage bag

Perfect For

Backpackers
Thru-hikers
Alpine climbers
3-season adventurers
Lightweight travellers