Osprey Dyna Action Parka

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The Dyna Action Parka is the perfect compromise between performance and packability for those venturing into variable winter conditions. It is a streamlined, technical layer for those who don’t compromise in winter conditions.

Montbell says: 

Waterproof, highly breathable SUPER DRY-TEC delivers protection from rain and snow and vents moisture in a stretchy form. Two types of face fabrics are purposefully combined to achieve supple comfort at a light weight. Features a versatile design for everything from winter mountaineering and ice climbing, to hiking in snow-free conditions.

(Unfortunately, we are unable to ship MontBell products outside of the UK)

Our Verdict

The Montbell Dyna Action Parka feels like a refined mountain shell for fast-paced missions.  Highly breathable and storm-ready, this shell strikes a balance between mobility and protection. At 400g (Medium), it delivers dependable waterproofing (20,000 mm) and outstanding breathability (60,000 g/m²/24 hrs), with stretch fabrics that don’t feel stiff or noisy.

What stands out is the hybrid construction: a more durable fabric is used across the shoulders and arms, while lighter 15-denier panels are used under the arms and across the back for improved airflow. The hood fits cleanly over a helmet, and the articulated sleeves and high collar add to its alpine-ready feel.

The pit vents and internal waist adjustment are well thought out, making it suitable for ski mountaineering, cold-weather trekking, or wet alpine scrambles where pace and protection are both key.

– Reviewed by Ultralight Outdoor Gear

Features

• SUPER DRY-TEC fabric provides waterproof and highly breathable properties in a stretchy form
• Tri-axial Hood ensures a snug fit and visibility 
• Helmet compatible hood fits over a climbing helmet 
• Zip End Guard protects your chin and face 
• Anti-Fog Collar minimizes eyewear fogging and frost around the mouth 
• Articulated arm improve fit and allow for dynamic movement 
• Alpine Cuff help keep wind and snow out 
• Pit zips vent heat and moisture 
• Weather resistant Aqua-Tect Zipper keeps out water in a lightweight form 
• 2-way front zipper allows for access from the bottom 
• Draw cords at the hem and waist help keep out cold drafts and snow. 
• Waist draw cord can be adjusted easily through the pockets. 
• Front internal hem adjustment delives a fine-tuned fit 
• 5 pockets (2 zippered hand pockets, 1 zippered left chest pocket, 1 zippered internal pocket, 1 unzippered internal pocket) 
• Stuff sack included

Specifications

• Small weighs: 389g
• Medium weighs: 400g
• Large weighs: 424g
• XLarge weighs: 437g
• Water resistance: 20,000 mm
• Breathability: 60,000 g/ m² / 24 hrs
• Compressed size: 12 x 19 cm

Material & Construction

• Body, sleeves, hood: 3-layer SUPER DRY-TEC Technology 30-denier friction-weave nylon
• Armpits, back: 3-layer SUPER DRY-TEC Technology 15-denier friction-weave nylon
• Water resistance: 20,000 mm
• Breathability: 60,000 g/ m² / 24 hrs

Help & advice:

• Time-Saver Guide to Choosing a Waterproof Jacket
• Choosing a Shell Jacket
• About Montbell
• MVTR and Breathability Explained
• What is Hydrostatic Head?
• What is Fabric Denier?