• Laetts black medium hiking crew socks with Merino wool and patent-allowed HygroHeat™ thermal technology, angled product display.
  • Laetts black medium hiking crew socks with Merino wool and patent-allowed HygroHeat™ thermal technology, flat lay product image.
  • Close-up texture detail of Laetts black medium hiking crew socks made with Merino wool and patent-allowed HygroHeat™ thermal yarn.
  • Laetts navy medium hiking crew socks with Merino wool and patent-allowed HygroHeat™ thermal technology, angled product display.
  • Laetts navy medium hiking crew socks with Merino wool and patent-allowed HygroHeat™ thermal technology, flat lay product image.
  • Close-up knit texture of Laetts navy medium hiking crew socks made with Merino wool and patent-allowed HygroHeat™ thermal yarn.
  • Laetts green medium hiking crew socks with Merino wool and patent-allowed HygroHeat™ thermal technology, angled product display.
  • Laetts green medium hiking crew socks with Merino wool and patent-allowed HygroHeat™ thermal technology, flat lay product image.
  • Close-up knit texture of Laetts green medium hiking crew socks made with Merino wool and patent-allowed HygroHeat™ thermal yarn.

Midweight Hiking — Light Cushion

Midweight Hiking — Light Cushion

Merino Thermal Socks — Warmth Without Bulk

$29.95
$29.95
SAVE Sold out

Patented HygroHeat™

Extra Fine Merino Wool

30 Day Return

Free-shipping on Orders $89.00+

Empowered by the Laetts Merino Thermal System™, this Midweight Hiking sock with Light Cushion construction pairs a fine-gauge Merino blend with patented HygroHeat™ for moisture-responsive warmth without bulk. Light underfoot terry provides just-right support for long miles, while a slim, breathable knit maintains comfort and control across mixed terrain.

Designed for extended movement, the Merino blend wicks moisture, resists odor, and adapts across changing activity levels—keeping feet dry, cozy, and comfortable from steep climbs to cool descents and everything in between.

Learn more: Merino Thermal System

Attributes

Shaft Height:    Crew

Weight:            Medium

Cushion：        Light-cushion

Form：             Anatomic

Style：             Sporty

Item Number：L202401∽03

Fibre Content

38% Acrylic，35% Wool, 20% Nylon, 6% Polyester, 1% Spandex

Care

Machine wash in warm water on gentle cycle, inside out. Do not bleach. Tumble dry low or hang dry. Do not dry clean. Do not iron.

Laetts black medium hiking crew socks with Merino wool and patent-allowed HygroHeat™ thermal technology, angled product display.

Midweight Hiking — Light Cushion

$29.95
$29.95
SAVE Sold out
View full details

MERINO THERMAL SYSTEM™

HYGROGHEAT™

BOOTGLIDE™

Warm & Light

Temperature-Regulating

Moisture-Wicking

Odor-Free Comfort

MERINO THERMAL SYSTEM™

HYGROGHEAT™

BOOTGLIDE™

Warm & Light

Temperature-Regulating

Moisture-Wicking

Odor-Free Comfort

MERINO THERMAL SYSTEM™

HYGROGHEAT™

BOOTGLIDE™

Warm & Light

Temperature-Regulating

Moisture-Wicking

Odor-Free Comfort

MERINO THERMAL SYSTEM™

HYGROGHEAT™

BOOTGLIDE™

Warm & Light

Temperature-Regulating

Moisture-Wicking

Odor-Free Comfort

Functions

  • HygroHeat™ Thermal Core

    Patented ceramic system reflects body heat using far-infrared (FIR) technology for self-sustaining warmth — without batteries or bulk.

  • Up to 8.8°C Warmer

    Lab-tested to retain significantly more warmth than standard Merino socks — for longer comfort in the cold.

  • Eco-Friendly Merino Blend

    Made with sustainably sourced Merino wool and performance yarns — soft on skin, lighter on the planet.

  • Natural Odor Control

    Merino’s natural antimicrobial properties help reduce odor — for fresher feet on long days.

  • Moisture-Regulating

    Engineered fibers actively manage sweat and moisture to keep feet dry and comfortable—even under sustained pressure.

  • Ultralight Thermal Build

    Designed to deliver high warmth-to-weight ratio — stays light in performance boots without sacrificing heat.

    Advanced Technology for Unmatched Warmth & Comfort

    How HygroHeat™ Works

    •  Patented Thermal System
      HygroHeat™ is Laetts’ patented thermal technology that generates warmth through ceramic particles embedded directly into the sock structure.

    • FIR-Emitting Ceramics & Reflective Design
      These particles emit far-infrared rays (FIR) to support circulation and thermal
      retention during activity. The visible white line on the sock is woven with
      reflective yarns that return body heat inward—no batteries, no external power.

    • Performance Warmth, Up to 8.8°C Warmer
      Lab-tested to retain heat better than leading ski sock brands, Laetts’
      HygroHeat™ keeps feet up to 8.8°C warmer.

    • Lightweight Comfort Without Bulk
      All the warmth—without heavy layers. Designed to maintain comfort across changing activity levels while preserving fit precision and mobility.

    Learn more: HygroHeat Technology