---
product_id: 258932621
title: "Merino.tech 100% Merino Wool Base Layer Mens - Thermal Underwear Long Johns"
brand: "merino.tech"
price: "R2331"
currency: ZAR
in_stock: true
reviews_count: 13
category: "Merino.Tech"
url: https://www.desertcart.co.za/products/258932621-merino-tech-100-merino-wool-base-layer-mens-thermal-underwear
store_origin: ZA
region: South Africa
---

# Midweight 250 g/m² for optimal warmth Includes premium Merino Wool hiking socks ($21 value) 100% Superfine 17.5 Micron Merino Wool Merino.tech 100% Merino Wool Base Layer Mens - Thermal Underwear Long Johns

**Brand:** merino.tech
**Price:** R2331
**Availability:** ✅ In Stock

## Summary

> 🧗‍♂️ Elevate your base layer game — stay warm, dry, and unstoppable!

## Quick Answers

- **What is this?** Merino.tech 100% Merino Wool Base Layer Mens - Thermal Underwear Long Johns by merino.tech
- **How much does it cost?** R2331 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/258932621-merino-tech-100-merino-wool-base-layer-mens-thermal-underwear)

## Best For

- merino.tech enthusiasts

## Why This Product

- Trusted merino.tech brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Ready for Action:** Stretchable, fitted design perfect for hiking, skiing, running, and more.
- • **Temperature Mastery:** Midweight fabric naturally regulates body heat for year-round wear.
- • **Gift-Ready Packaging:** Cool, premium packaging makes it the ultimate thoughtful gift for outdoor pros.
- • **Odor-Free Confidence:** Natural moisture-wicking and odor resistance keep you fresh on every adventure.
- • **All-Day Comfort, Zero Itch:** Super soft, breathable Merino wool keeps you cozy without irritation.

## Overview

Crafted from 100% superfine 17.5 micron Merino wool, these midweight (250 g/m²) men's base layer pants deliver superior warmth, moisture management, and odor resistance. Designed for active outdoor lifestyles, they come with matching Merino hiking socks and feature a stretchable, fitted cut for all-day comfort. Machine washable and backed by the Merino.tech Promise, they’re the smart choice for year-round performance and effortless style.

## Description

Buy Merino.tech 100% Merino Wool Base Layer Mens - Thermal Underwear Long Johns (Large, Charcoal Grey 250) and other Bottoms at desertcart.com. Our wide selection is elegible for free shipping and free returns.

Review: Great Woolies - Great, thin, warm, comfortable woolies. I would by again. They pack small, wear comfortably and are very warm without being overly-warm. They are thin and fit great underneath anything.
Review: Merino wool long johns are the bomb - Excellent fit and comfort and warmth

## Features

- MIDWEIGHT: Mens Merino Base Layer Available in: Lightweight 165 g/m², Midweight 250 g/m², Heavyweight 320 g/m². Merino Wool Hiking Socks ($21 Value!) - Midweight Merino Wool Pants for Men 250 g/m² and Wool Socks. Cool Packaging! Makes A Great Gift!
- SUPER SOFT & COMFORTABLE: 100% Superfine 17.5 Micron Merino Wool Underwear Mens provide all day comfort and no itch! Designed for daily wear without rubbing and overheating of regular cotton.
- MOISTURE WICKING & ODOR RESISTANT: Merino long underwear mens natural wicking and odor-resistant properties allow it to absorb moisture better than any other fabric, keeping you dry and fresh.
- EASY CARE: Washer/dryer safe. For longer lasting wear, hand wash and air dry. Midweight Merino Wool Base Layer Mens naturally regulates body temperature to keep you comfortable all year round.
- ZERO WORRIES: Every Merino.tech Merino pants thermals for men we make is backed by our Merino.tech Promise - ensuring you're 100% happy with every Merino.tech purchase.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08JVMMW4D |
| Age Range Description | Adult |
| Apparel Closure Type | Pull On |
| Apparel Fabric Stretch | Medium Stretch |
| Apparel Fabric Weight Class | Medium Weight |
| Apparel Occasion and Lifestyle | Outdoor |
| Best Sellers Rank | #9,949 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #5 in Men's Thermal Underwear Bottoms |
| Brand Name | Merino.tech |
| Care instructions | Machine Wash (Delicate Cycle), Hand Wash Recommended |
| Closure type | Pull On |
| Color | . Charcoal Grey 250 |
| Customer Reviews | 4.6 out of 5 stars 3,625 Reviews |
| Fabric Stretchability | Stretchable |
| Fabric Type | 100% Superfine Merino Wool |
| Fabric type | 100% Superfine Merino Wool |
| Fit Type | Standard |
| Fit to Size Sentiment | Fits True To Size |
| Front Pleat Type | Flat Front |
| Garment Size Country | United States |
| Import Designation | Imported |
| Item Length Description | Standard Length |
| Leg Style | Skinny |
| Manufacturer Part Number | MP-250 |
| Material Type | 100% Superfine Merino Wool |
| Model Name | Men Pants |
| Number of Items | 1 |
| Occasion Type | Hiking |
| Origin | Imported |
| Pants Form Type | Leggings |
| Pattern | Solid |
| Pattern Style | Solid |
| Pocket Description | No Pocket |
| Product Care Instructions | Machine Wash (Delicate Cycle), Hand Wash Recommended |
| Rise Style | Mid Rise |
| Seasons | All |
| Specific Uses For Product | Hiking, Sports, Yoga |
| Sport Type | Hiking, Snow Skiing, Snowboarding, Camping and Hiking, Running, Climbing, Mountaineering, Cycling |
| Style Name | Modern/Fitted |
| Style Number | MP-250 |
| Team Name | Sports |
| Ultraviolet Protection Factor | UPF 50 |
| Unit Count | 1 Count |
| Waist Size | 38 inches |
| Weave Type | Knit |

## Images

![Merino.tech 100% Merino Wool Base Layer Mens - Thermal Underwear Long Johns - Image 1](https://m.media-amazon.com/images/I/61deebLwCVL.jpg)

## Available Options

This product comes in different **Color, Size** options.

## Questions & Answers

**Q: Won't merino wool feel itchy? And what does 17.5 micron mean?**
A: 17.5 micron superfine merino fibers are finer than human hair — too fine to feel itchy, even on sensitive skin. Standard wool (25+ microns) causes irritation; this doesn't. OEKO-TEX certified, tested against 100+ harmful substances.

**Q: How do I wash and dry it to keep it looking new ? Will it shrink or lose shape?**
A: Machine wash cold max 30°C, delicate cycle, inside out. Lay flat to dry — tumble drying permanently damages merino fibers. Store clean and dry; keep merino in sealed bags to prevent moths. Wear 3–5 days between washes — merino resists odor naturally

**Q: Which weight should I choose — 165, 250, or 320 g/m²?**
A: 165 g/m² — active pursuits, travel, spring/summer, 40–60°F. 250 g/m² — cold weather, most outdoor activities, 25–45°F. 320 g/m² — frost and low activity, 10–35°F, extreme conditions. Rule: the higher the activity level — the lighter the weight.

**Q: Where does the merino wool sourced from and is this product certified?**
A: Our products are made from Australian merino wool, RWS certified — independent farm audit confirming animal welfare and land management standards. Every component tested against 100+ harmful substances under OEKO-TEX Standard 100.

**Q: Does it fit true to size?**
A: Choose your regular size. For a snug layering fit under jackets or ski gear, size down one

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great Woolies
*by S***R on September 12, 2026*

Great, thin, warm, comfortable woolies. I would by again. They pack small, wear comfortably and are very warm without being overly-warm. They are thin and fit great underneath anything.

### ⭐⭐⭐⭐⭐ Merino wool long johns are the bomb
*by C***Y on October 5, 2026*

Excellent fit and comfort and warmth

### ⭐⭐⭐⭐⭐ Comfy Warmth
*by M***G on April 2, 2023*

The only way to know if this garment is comfy, warm, non-itching and fits well is to ... wear it. I did exactly that shortly after I received it. I wore it for 3 straight days. I notice the top is pilling a little bit (what else should you expect from wool), but the top and the bottoms held up to one cycle in gentle wash. The garment instructions that came on a printed card with the piece say something a bit different from the instructions printed on the garment. For example, the card instructions say NOT to place in the dryer, but the instructions on the piece itself say "Turn inside out. Machine wash cold on gentle cycle with like colors. Lay flat to dry recommended or machine dry on low heat. Do not bleach. Do not dry clean, Do not wring dry." So it seems they don't recommend using a dryer, however a fluff cycle in the dryer is the best way we know of to get pet hair off... so that's what we opt for before - or after - laying it out flat to finish dry. I do notice that the tag (which I summarized above - and have included a photo of) is likely to come off... but those tags are often a comfort nuisance. You DO need a magnifying glass to read that tag! I also notice that the pieces we received were made in China (PRC). The fit is good, comfy, and just like the top it's warm, non-itchy with no abrasive seams to irritate my skin. We all have probably had an experience of getting a garment with a tag that is so annoying that you want to rip it off ASAP - either because the tag itself is scratchy or the sewing holding the tag to the garment is obnoxious. This tag is long and thin, but not annoying. How well it will hold up to use remains to be seen... but I don't see anything that makes me think it is likely to fall apart or get threadbare easily. Indeed, the best thing I can say about this garment is that it is MORE comfortable AND warmer than the cotton long johns I have. Cotton is pretty miserable thing to have next to your skin in the cold when you sweat or it gets wet. All the pieces I've purchased so far come with a free pair of Merino socks. The socks are not very thick, but they do seem ok.

## Frequently Bought Together

- Merino Wool Base Layer Mens Bottom Pants 100% Merino Wool Lightweight, Midweight Thermal Underwear Long Johns + Wool Socks
- Merino.tech Merino Wool T-Shirt Mens - 100% Organic Merino Wool Undershirt Lightweight Base Layer + Hiking Wool Socks
- Merino.tech Merino Wool Base Layer - Mens 100% Merino Wool Long Sleeve Thermal Shirts Lite, Midweight, Heavyweight + Socks

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**Shop now:** [https://www.desertcart.co.za/products/258932621-merino-tech-100-merino-wool-base-layer-mens-thermal-underwear](https://www.desertcart.co.za/products/258932621-merino-tech-100-merino-wool-base-layer-mens-thermal-underwear)

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-10-17*