• Men’s Laetts Heavy+ Fishing Crew Socks with patented HygroHeat™ far-infrared warming and Merino wool blend, gray with navy stripes, 3D product image.
  • Men’s Laetts Heavy+ Fishing Crew Socks, Merino wool blend with patented HygroHeat™ warming, gray and navy striped, flat lay product image.
  • Macro close-up of Laetts Heavy+ Fishing Crew sock fabric, showing Merino wool and patented HygroHeat™ looped thermal interior in navy and gray stripes.
  • Laetts Heavy+ women's fishing socks in red and navy stripes, crew height, made with Merino wool and patented HygroHeat™ thermal yarn blend, 3D product view.
  • Laetts Heavy+ women's crew fishing socks laid flat, red and navy stripes, Merino wool with patented HygroHeat™ thermal yarn blend.
  • Close-up texture detail of Laetts Women’s Heavy+ Merino Wool Fishing Crew Sock, showing red and navy HygroHeat™ thermal knit fabric.

Heavyweight+ Outdoor — Crew • Full Cushion

Heavyweight+ Outdoor — Crew • Full Cushion

Merino Thermal Socks — Warmth Without Bulk

$39.95
$39.95
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 Heavyweight+ Outdoor Crew sock with Full Cushion construction is built for maximum insulation in extreme cold. A dense Merino and HygroHeat™ blend delivers powerful, self-sustaining warmth and active moisture control, while full-foot terry with extended loops creates high loft to blunt cold-ground bite and ease long, static stands in boots or waders.

Designed in a versatile crew height for extended outdoor wear, a stable, resilient knit resists sag and compression when wet, while reinforced heel and toe zones enhance durability. Ideal for fishing, hunting, and cold-weather work, this is Laetts’ heaviest construction—made for situations where thermal mass and lasting comfort matter most.

Learn more: Merino Thermal System

Attributes

Shaft Height:   Crew

Weight:            Heavy+

Cushion：        Full-cushion strong

Form：             Anatomic

Style：             Sporty

Item Number: OUT-H+-25-CR

Fibre Content

43% Nylon, 31% Wool, 25% 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.

Men’s Laetts Heavy+ Fishing Crew Socks with patented HygroHeat™ far-infrared warming and Merino wool blend, gray with navy stripes, 3D product image.

Heavyweight+ Outdoor — Crew • Full Cushion

$39.95
$39.95
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.

  • Eco-Friendly Merino Blend

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

  • Up to 8.8°C Warmer

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

  • Moisture-Regulating

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

  • Natural Odor Control

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

    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