Fjallraven Deviator Fleece Half Zip

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Built for movement and comfort, the Deviator is a fantastic mid-layer choice for active, cool-weather outings.

Outdoor Research says: 

The Deviator Fleece Half Zip offers superior warmth and breathability with thermo-regulating ActiveTemp™ for multi-use, high-aerobic versatility, worn alone or layered underneath a shell.

Our Verdict

The Outdoor Research Deviator Fleece Half Zip is an impressively versatile mid-layer designed for high-output activities in cool conditions. Its hybrid construction combines quick-drying, moisture-wicking polyester in the core with a flexible polyester-spandex blend at the arms and underarms. This thoughtful design keeps warmth where it’s most needed and allows for superb freedom of movement.

The VerticalX Octa insulation is a highlight for me—lighter than typical fleece insulation, it provides warmth without the bulk, making it ideal for trail running and winter hikes. The Deviator’s 13 cm front zip helps with quick ventilation, while thumb loops and a zippered chest pocket add functionality. The fleece also offers UPF 30 protection and has reflective logo details for better visibility.

This fleece is lightweight yet durable, at around 307 grams for a medium. It’s warm and breathable, keeping me comfortable even when my pace picks up. The Deviator Fleece Half Zip is an adaptable, efficient layer, great for active pursuits when temperatures dip.

– Reviewed by Ultralight Outdoor Gear

Features

Fabric Performance:

• Breathable
• Hybrid Mapped Construction
• Movement Mirroring Stretch
• Quick Drying
• Thermo-Regulating ActiveTemp™ Treatment
• UPF 30
• Wicking

Design Features:

• 13″ (33cm) Center Front Zipper
• Chafe-Free Design with Raglan Sleeves and Dynamic Reach
• Ergonomic Fit Thumb Holes
• Flat-Seam Construction
• Reflective Logo
• Zip Chest Pocket

Specifications

• Small weighs: 281g
• Medium weighs: 307g
• Large weighs: 329g
• XLarge weighs: 360g

Material & Construction

• Front/Back Body: 100% Polyester Collar
• Arms & Underarms: bluesign® approved 94% Polyester, 6% Spandex

Help & advice:

• The Bluesign System