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Ullfrotté Original 400

#6 on this list

Ullfrotté Original 400

Woolpower

Swedish terry-loop wool worn by arctic militaries. Loft that survives repeated washing.

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Super Thermo Mesh

#7 on this list

Super Thermo Mesh

Brynje

The Norwegian mesh string layer — bizarre-looking, unmatched moisture handling in deep cold.

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Specs side by side

Ullfrotté Original 400 versus Super Thermo Mesh specifications
SpecUllfrotté Original 400Super Thermo Mesh
MakerWoolpowerBrynje
MaterialUllfrotté Original (Merino Wool/Polyamide)Polypropylene Mesh
Weight ClassMid-Heavyweight (400 g/m²)Lightweight / Midweight Layering
ConstructionTerry-loop knitOpen Mesh Knit
OriginSweden
Best ForExtreme cold, low activityDeep Cold, High Output
ModelSuper Thermo Mesh

What our reviewers liked and didn't

Ullfrotté Original 400

  • Exceptional warmth in extreme cold
  • Highly durable, resists wear and tear
  • Terry-loop knit traps air effectively
  • Maintains insulating loft after washing
  • Wicks moisture surprisingly well for its thickness
  • Retains warmth even when damp
  • Bulky and less packable than lighter alternatives
  • Can be too warm for high-output activities or milder conditions
  • Higher price point compared to standard base layers

Super Thermo Mesh

  • Unmatched moisture wicking in high-exertion, cold environments
  • Creates excellent insulating air pocket when layered properly
  • Exceptional warmth-to-weight ratio for its category
  • Quick-drying properties prevent chilling
  • Surprsiingly durable for its open-knit construction
  • Unconventional appearance, not suitable as a standalone layer
  • Requires proper layering to maximize insulation benefits
  • Polypropylene can retain odors if not washed promptly
  • Not ideal for casual wear or low-output activities
  • Can feel slightly abrasive to some sensitive skin types

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