---
product_id: 136725764
title: "Mens Base Layer 100% Merino Wool Heavyweight 400g Thermal Shirt for Men"
price: "€ 118.19"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.ie/products/136725764-mens-base-layer-100-merino-wool-heavyweight-400g-thermal-shirt
store_origin: IE
region: Ireland
---

# 100% superfine 18.5 micron Merino wool 400g/m² heavyweight warmth Machine washable & dryer safe Mens Base Layer 100% Merino Wool Heavyweight 400g Thermal Shirt for Men

**Price:** € 118.19
**Availability:** ✅ In Stock

## Summary

> 🔥 Stay warm, stay unstoppable — the heavyweight base layer that means business.

## Quick Answers

- **What is this?** Mens Base Layer 100% Merino Wool Heavyweight 400g Thermal Shirt for Men
- **How much does it cost?** € 118.19 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/136725764-mens-base-layer-100-merino-wool-heavyweight-400g-thermal-shirt)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Odor-Free Performance:** Natural wool wicks moisture and resists odors, keeping you fresh through extended use.
- • **All-Day Comfort, Zero Itch:** Superfine 18.5 micron wool ensures softness that feels like a second skin.
- • **Ultimate Thermal Powerhouse:** 400g heavyweight Merino wool delivers unmatched warmth for freezing conditions.
- • **Effortless Care & Durability:** Machine washable and dryer safe for hassle-free maintenance and long-lasting wear.
- • **Versatile Adventure Essential:** UPF 50+ protection and quick-drying fabric make it perfect for hiking, skiing, and outdoor sports.

## Overview

The MERIWOOL Mens Base Layer Thermal Shirt is crafted from 100% superfine 18.5 micron Merino wool with a heavyweight 400g/m² density, offering superior insulation for cold to freezing temperatures. Designed with a fitted cut, it combines exceptional softness, natural moisture-wicking, and odor resistance. Machine washable and dryer safe, this thermal crewneck is your go-to base or mid-layer for outdoor adventures, backed by a 90-day warranty and hassle-free returns.

## Description

Buy MERIWOOL Mens Base Layer 100% Merino Wool Heavyweight 400g Thermal Shirt for Men Black and other Active Base Layers at desertcart.com. Our wide selection is elegible for free shipping and free returns.

Review: This shirt rocks! - I just love this shirt (have it on now). The quality is outstanding and it is super warm. If you don't know what 400g merino wool is like .. this thing is closer to a sweater than a shirt. It is THICK. I have three of these an basically wear them all winter because I am cold natured. This shirt totally is not a base layer. I still wear a base layer of 100g merino wool under this shirt. A 100g merino wool base layer, this bad boy, and a 650 lightweight down jacket get me through winter most of the time. I do swap out the jacket for a serious down puffer when it gets REALLY cold and I am going to be outside. Above freezing, the shirt and a light down jacket are great. I don't hike in this thing because my god it gets hot fast. So, not to totally freak you out :). I. have yet to wash one of these shirts. Wool never stinks. I have worn this shirt for days, slept in it, never bathed, etc. Never stinks and I never wash them. I have a LOT of wool shirts I wear all winter and summer. This particular shirt comes in this 400g monster, as well as a variety of lesser weights. I have a range of them and wear them year round. Just beware marino wool is addictive. These things are SO soft and warm. OK, so I am 5'10" and 185-190 lbs. I am kinda muscular and "big boned" I guess. Normally, I would wear a large or maybe a xl in shirts. I don't think these shirts claim to be fitter, but yeah, they are. I like a loose shirt, so XXL works best for me. So, I guess they run small unless you are a stick. If you like fitted shirts, maybe get your size. I don't know if they pill because I've never washed on. If you DO wash it pay particular attention to instructions or you will shrink it or any other wool garment into something your toddler can't wear. Sorry for the book. Just trying to provide useful information on sizing. It always helps me to read reviews where folks tell how big they are an how sizing goes for a garment.
Review: Good thermal shirt - I use this mostly for single-sculling and it keeps me comfortable when temperatures hit the 30s and low 40s around Lake Union. Based on my experience, this is a high-quality thermal shirt.

## Features

- PACKAGE INCLUDES: 1 – Men’s Merino Wool Thermal Crewneck Top in Black / Medium | MATERIAL: 18.5 Micron, 100% Merino wool, 400g/m2 | FIT: Fitted
- SUPER SOFT: 100% all natural superfine 18.5-micron Merino wool ensures comfort all day – no itch! EASY CARE: Heavyweight long sleeve crew top shirt is machine-washable and dryer-safe, so it’s ready when you are for your next adventure.
- 400g OF WARMTH: Our most popular 250g midweight crewnecks just got an upgrade! Take your warmth to the next level with our new 400g heavyweight crewneck tops. The perfect base or mid layer for cold to freezing conditions make these thermal tops our warmest and thickest base layers yet! COMFORTABLE & CONVENIENT: These quick-drying shirts with a UPF Rating 50+ are perfect for your next trip, whether your camping, hiking, hunting, playing sports, skiing, or partaking in any outdoors activity.
- WICKING & ODOR RESISTANCE: Merino wool’s natural wicking and odor-resistant properties keep you dry and comfortable while active in cold weather. Through the process of wicking, Merino wool is the most breathable fabric and absorbs moisture better than any other fibers. Wicking refers to a fabric’s ability to pull moisture away from your body and keep you comfortable.
- EXCEPTIONAL CUSTOMER CARE: If your MERIWOOL Men’s Heavyweight Baselayer Crew doesn’t perform to your satisfaction, return it to us within 30 DAYS along with proof of purchase for a hassle-free refund, exchange, or replacement. Includes a 90 DAY limited manufacturer’s warranty.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Care instructions | Machine Wash, Hand Wash Only |
| Closure type | Pull On |
| Fabric type | 100% Merino Wool |
| Origin | Imported |

## Images

![Mens Base Layer 100% Merino Wool Heavyweight 400g Thermal Shirt for Men - Image 1](https://m.media-amazon.com/images/I/610aW-3ueTL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ This shirt rocks!
*by B***S on January 11, 2025*

I just love this shirt (have it on now). The quality is outstanding and it is super warm. If you don't know what 400g merino wool is like .. this thing is closer to a sweater than a shirt. It is THICK. I have three of these an basically wear them all winter because I am cold natured. This shirt totally is not a base layer. I still wear a base layer of 100g merino wool under this shirt. A 100g merino wool base layer, this bad boy, and a 650 lightweight down jacket get me through winter most of the time. I do swap out the jacket for a serious down puffer when it gets REALLY cold and I am going to be outside. Above freezing, the shirt and a light down jacket are great. I don't hike in this thing because my god it gets hot fast. So, not to totally freak you out :). I. have yet to wash one of these shirts. Wool never stinks. I have worn this shirt for days, slept in it, never bathed, etc. Never stinks and I never wash them. I have a LOT of wool shirts I wear all winter and summer. This particular shirt comes in this 400g monster, as well as a variety of lesser weights. I have a range of them and wear them year round. Just beware marino wool is addictive. These things are SO soft and warm. OK, so I am 5'10" and 185-190 lbs. I am kinda muscular and "big boned" I guess. Normally, I would wear a large or maybe a xl in shirts. I don't think these shirts claim to be fitter, but yeah, they are. I like a loose shirt, so XXL works best for me. So, I guess they run small unless you are a stick. If you like fitted shirts, maybe get your size. I don't know if they pill because I've never washed on. If you DO wash it pay particular attention to instructions or you will shrink it or any other wool garment into something your toddler can't wear. Sorry for the book. Just trying to provide useful information on sizing. It always helps me to read reviews where folks tell how big they are an how sizing goes for a garment.

### ⭐⭐⭐⭐⭐ Good thermal shirt
*by N***3 on December 2, 2025*

I use this mostly for single-sculling and it keeps me comfortable when temperatures hit the 30s and low 40s around Lake Union. Based on my experience, this is a high-quality thermal shirt.

### ⭐⭐⭐⭐⭐ soft and warm
*by T***T on February 8, 2025*

Like the description says, it's a 400g fabric and it is substantial. Very soft and warm. Pretty trim fit which works well as a base layer. I'd consider myself more in the Large size range but this being wool and me having a penchant for accidentally washing wool stuff with the wrong cycle/detergent and shrinking it, i bought an XL. Out of the package it fit snug. Not too tight but about how i hoped it would fit after a couple washes. I'm going to be careful when cleaning it to try not to shrink it at all. Would recommend sizing up. Not a fan of the elastic band on the back of neck. It sort of pokes you. Also the back of the neck has a size tag which is adhered with glue? it fell off in the wash and left a sticky spot that had to be removed.

## Frequently Bought Together

- MERIWOOL Mens Base Layer 100% Merino Wool Heavyweight 400g Thermal Shirt for Men
- MERIWOOL Mens Base Layer - 100% Merino Wool Midweight Long Sleeve Thermal Shirt
- MERIWOOL Mens Base Layer 100% Merino Wool Thermal Pants

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.ie/products/136725764-mens-base-layer-100-merino-wool-heavyweight-400g-thermal-shirt](https://www.desertcart.ie/products/136725764-mens-base-layer-100-merino-wool-heavyweight-400g-thermal-shirt)

---

*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-02-22*