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Black Diamond Mercury Mitt
#9 — Best Deep Cold Mitten

Black Diamond Mercury Mitt Review (2026)

The removable-liner mitt that rescues cold hands below 10°F

★★★★★
9.0/10
Reviewed by William • Updated August 2026 $150

If your hands go numb in gloves that work fine for everyone else, this is the fix. Mitt geometry lets fingers share heat, the PrimaLoft fill and split-leather shell handle serious cold, and the BD.dry insert means wet snow does not end the day. The removable fleece liner is the feature that makes it practical: pull the shell off to handle a stove or a zipper, then put it back on to rewarm. It is bulky, it is $150, and it is unnecessary for most three-season hiking.

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$150 retail
TrailCraft Score

What Works

  • Genuinely warm below 10°F
  • Removable liner for camp tasks
  • Waterproof BD.dry insert
  • Split leather palm survives hard use
  • Long gauntlet cuff seals over a jacket

Limitations

  • $150
  • Bulky and poor dexterity by design
  • Overkill above 20°F
  • Slow to dry once the liner soaks

At a Glance

TypeInsulated mitten
InsulationPrimaLoft Gold, fleece liner
ShellSplit leather / nylon, BD.dry insert
Weight8.5oz / 241g pair
WaterproofYes — BD.dry insert
Temp range-15 to 20°F
WarrantyBlack Diamond limited

Score Breakdown

Value for Money
8.2
Dexterity
6.4
Warmth
9.8
Durability
9.2
Weather Protection
9.6

What Sets It Apart

Bought for a January trip after a previous winter of cold hands in five-finger gloves. The difference is not incremental — mitt geometry is worth roughly 15-20°F over an equivalently insulated glove. The removable liner solves the usual mitt complaint: you are not helpless when you need to work a buckle.

The removable-liner mitt that rescues cold hands below 10°F

Who This Is For

Anyone with cold-prone hands or Raynaud's, winter campers, and hikers heading somewhere genuinely cold who want one item to solve the problem.

Note: Prices are current as of August 2026. Some links are affiliate links.

Also Consider

See the full comparison

All 15 options in this category ranked side by side.

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Common Questions

Mittens or gloves for cold hands?
Mittens, by a wide margin. Fingers share heat in one chamber instead of each radiating separately. The cost is dexterity, which removable liners partly recover.
Are these too warm for a mid-Atlantic winter?
Usually yes for hiking, often right for camp. Below about 20°F they earn their place.