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Thermagrid Fleece
Breathable warmth engineered for movement in cold mountain conditions.
Part of the Explore Collection3.8 · 5 reviewsEarn 414 TrekX points
The Thermagrid Fleece is a lightweight technical midlayer designed for trekking, alpine hiking, and high-output outdoor movement in cooler environments. Constructed with grid-fleece thermal fabric, it balances warmth retention, breathability, and moisture management during changing weather and elevation. Optimized for layering beneath waterproof shells or wearing independently during active movement, it delivers versatile thermal performance without unnecessary bulk.
Ideal for
- ◆Alpine trekking layers
- ◆Cold-weather hiking
- ◆Active mountain movement
- ◆Midlayer expedition systems
Colour: Midnight
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Specifications
FABRICGrid-fleece recycled polyester blend
Grid-fleece recycled polyester blend≈ 340g
THERMAL STRUCTUREBreathable waffle-grid insulation
FITAthletic layering fit
ZIPPERYKK half-zip thermal collar
BREATHABILITYHigh airflow moisture-management fabric
CUFFSLow-profile elastic cuffs
PACKABILITYLow-bulk compressible structure
CERTIFICATIONbluesign® approved materials
Product Deep-Dive
D.01
How It’s Made
The Thermagrid Fleece is constructed from recycled polyester fibers knitted into a waffle-grid structure engineered to trap warmth while improving airflow and moisture release during movement.
D.02
Thermal Efficiency & Breathability
The grid-fleece architecture creates insulating air pockets that retain warmth while minimizing overheating during high-output trekking and alpine ascents.
D.03
Layering Performance
The athletic silhouette is optimized to fit comfortably beneath waterproof shells without restricting movement or creating excess bulk inside layering systems.
D.04
Moisture Management
Hydrophobic synthetic fibers move moisture away from the body and dry rapidly during changing weather conditions and demanding outdoor activity.
D.05
Lightweight Expedition Utility
The low-bulk construction compresses efficiently inside trekking packs while remaining warm enough for cold-morning starts and high-altitude environments.
D.06
Intended Use
Designed for trekkers, climbers, and alpine travelers requiring breathable thermal insulation during active mountain movement and expedition layering systems.
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Customer Reviews
3.85 reviews
5
40%
4
0%
3
60%
2
0%
1
0%
Rosa MeierSeattle, United States
Dec 2025
Worked better in some conditions than others
I started paying attention to the Thermagrid Fleece once conditions became less predictable. After enough use, the overall setup feels versatile enough for both short hikes and ambitious weekends. Comfort is excellent overall, though you notice small tradeoffs during very long days. It solved more problems than it created.
Verified purchaseTrekX reply
This kind of review helps future trekkers set expectations properly.
Dario BennettTrento, Italy
Oct 2025
Worked well in changing conditions
My first real use of the Thermagrid Fleece was a chilly campsite morning followed by warmer valley temperatures. I kept noticing that it worked well across changing temperatures and stop-start movement. The practical value outweighed small complaints. It quietly earned repeat use.
Verified purchaseChiara FosterVancouver, Canada
Jul 2022
Useful Explore gear, but not perfect
I bought the Thermagrid Fleece after debating between a few similar options. After repeated use, it stayed comfortable through longer days where small annoyances usually add up. I would prefer slightly clearer setup guidance for first-time users. It gives enough performance to feel rewarding without becoming intimidating.
Verified purchaseIris GomezSkiathos, Greece
Jul 2022
Stayed reliable when conditions changed
I bought the Thermagrid Fleece with realistic expectations rather than hype. Nothing about it felt exaggerated — the comfort-to-performance balance worked well across mixed terrain and changing weather. The reliability mattered more than standout features.
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Thermagrid Fleece