Nothing Extra. Everything You Need.

The Western Mountaineering MonoLite is the definition of minimalist performance-designed for climbers and adventurers who want maximum efficiency with zero unnecessary features.

With a micro-baffled construction, 850+ fill power down, and ultralight 10D shell, it delivers reliable warmth down to 3°C while packing down to the size of a Nalgene bottle.

Built for fast and light missions, the MonoLite strips away excess weight while retaining essential performance features like an insulated collar and draft tube.

Why You'll Love It

Ultra-minimal design - No unnecessary features
Extremely lightweight - From ~370g
Packs tiny - Bottle-sized packed volume
850+ fill power down - Premium insulation
Built for speed - Perfect for fast & light missions

Built for Ultralight Missions

Perfect for:

Fastpacking
Bikepacking
Climbing trips
Adventure racing
Minimalist backpacking

Designed for those who count every gram

Performance Features

Ultralight Minimalist Construction

Stripped-back design

Provides:

Maximum weight savings
Reduced bulk
High efficiency

Lightweight Warmth (3°C)

Ideal for mild conditions

Best for:

Summer use
Warm climates
Layered sleep systems

Micro-Baffled Construction

Precision insulation design

Improves:

Down distribution
Thermal efficiency
Elimination of cold spots

Half-Length #3 YKK Zipper

Weight-saving design

Allows:

Ventilation control
Minimal bulk
Reliable operation

Insulated Collar & Draft Tube

Essential heat retention

Helps:

Seal in warmth
Prevent heat loss
Maintain comfort

10D Nylon Shell (PFC-Free DWR)

Ultra-light and eco-conscious

Benefits:

Breathability
Water resistance
Reduced environmental impact

Ultra-Compact Pack Size

Packs to bottle size

Perfect for:

Bikepacking setups
Small packs
Minimalist kits

Technical Specifications

Temperature Rating: 3°C
Fill: 850+ Fill Power Goose Down
Loft: 9.5 cm (3.75")
Shell Fabric: 10D nylon with PFC-free DWR

Weights:
180cm: 370g
200cm: 400g

Fill Weights:
180cm: 192g
200cm: 214g

Girth (Shoulder/Hip/Foot):
180cm: 150 / 129 / 99 cm
200cm: 150 / 132 / 99 cm

Packed Size:
All sizes: ~12.5 x 25.5 cm

Origin: USA

Includes:
Ultralight stuff sack
Breathable mesh storage bag

Perfect For

Ultralight backpackers
Fastpackers
Bikepackers
Climbers
Adventure racers