---
product_id: 127306869
title: "ECWCS Gen III Mid-Weight Underwear Bottoms - Insulated Cold Weather Base Layer"
brand: "rothco"
price: "R1486"
currency: ZAR
in_stock: true
reviews_count: 8
category: "Rothco"
url: https://www.desertcart.co.za/products/127306869-ecwcs-gen-iii-mid-weight-underwear-bottoms-insulated-cold-weather
store_origin: ZA
region: South Africa
---

# Moisture-wicking grid fleece Insulated to -40°F Flexible polyester/spandex blend ECWCS Gen III Mid-Weight Underwear Bottoms - Insulated Cold Weather Base Layer

**Brand:** rothco
**Price:** R1486
**Availability:** ✅ In Stock

## Summary

> ❄️ Stay warm, dry, and unstoppable in the coldest conditions!

## Quick Answers

- **What is this?** ECWCS Gen III Mid-Weight Underwear Bottoms - Insulated Cold Weather Base Layer by rothco
- **How much does it cost?** R1486 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/127306869-ecwcs-gen-iii-mid-weight-underwear-bottoms-insulated-cold-weather)

## Best For

- rothco enthusiasts

## Why This Product

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

## Key Features

- • **Layer Like a Pro:** Pairs perfectly with matching ECWCS Gen III tops for unbeatable cold-weather defense
- • **Ergonomic Comfort Fit:** Soft, stretchy fabric moves with you—no bunching or gaps, even when bending 🧘‍♂️
- • **Military-Grade Warmth:** Trusted by active-duty personnel for extreme cold down to -40°F ❄️
- • **Tactical-Ready Design:** Elastic waist, access fly, and durable build made for rugged outdoor use
- • **Next-Level Moisture Control:** Advanced grid fleece wicks sweat fast, keeping you dry and comfortable 🌀

## Overview

Rothco ECWCS Gen III Mid-Weight Underwear Bottoms are a military-grade insulated base layer designed for extreme cold weather. Made from breathable, moisture-wicking grid fleece with a polyester/spandex blend, these bottoms provide flexible comfort and durability. Rated for temperatures as low as -40°F, they feature an elastic waist, access fly, and are part of the Extended Cold Weather Clothing System, making them ideal for tactical professionals and outdoor enthusiasts seeking reliable warmth and dryness.

## Description

Buy Rothco ECWCS Gen III Mid-Weight Underwear Bottoms - Insulated Cold Weather Base Layer, AR 670-1 Coyote Brown, XL: Pants - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Great option for cold weather adventures! - The ECWS tops and bottoms offer amazing performance at a good price. I have used these bottoms to layer under fleece pants and hard shell bibs or breathable waders in temperatures down to -12 F. When appropriately layered, they are unbeatable in the duck blind or on stand in the winter. As a tall person, I like that the sizing covers long legs and long legs without any gaps around the waist, even when bending over. In addition to be warming, they are durable and suitable for outdoor adventures. I took two top/bottom sets to Alaska for a two-week rafting trip this summer and I was comfortable, even when it rained for four days. 10/10. But with confidence…and buy the zip top while you are at it.
Review: The last thermals you’ll ever need! - Same thing issued to the US military.Comfortable material. Rated for -40°F. Worth every penny.

## Features

- Powerful Insulation: Made from breathable, mid-weight grid fleece material that is great for layering, our ECWCS Gen III Level II Underwear Bottoms are designed to keep you warm, comfortable, and dry, even in the harshest winter weather
- Stay Warm & Dry: The base layer pants wick sweat and moisture away for optimum comfort, swiftly transferring it to the top layer for a quick dry, allowing you to move freely without your clothing sticking to you
- Comfortable Fit: Built from a soft polyester / spandex blend, the grid fleece fabric easily flexes and contorts with your body for optimum comfort; the base layer pants feature an access fly, along with an elastic waist and leg bottoms
- Active-Duty Approved: The thermal bottoms are part of the Extended Cold Weather Clothing System (ECWCS) and are a must-have for any active-duty personnel, tactical professional, or outdoor enthusiast in cold climates
- Better Together: Stay warm and comfortable this winter with our matching ECWCS Gen III Level II Underwear Tops; the base layer shirt features the same breathable, mid-weight grid fleece material as the bottoms

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN  | B018MSROZ0 |
| Best Sellers Rank | #80,598 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #19 in Men's Military Pants |
| Customer Reviews | 4.6 4.6 out of 5 stars (783) |
| Date First Available  | August 25, 2010 |
| Department  | mens |
| Item model number  | 69034LRG |
| Manufacturer  | Rothco |

## Images

![ECWCS Gen III Mid-Weight Underwear Bottoms - Insulated Cold Weather Base Layer - Image 1](https://m.media-amazon.com/images/I/614kEuKVF6L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great option for cold weather adventures!
*by R***Y on December 22, 2022*

The ECWS tops and bottoms offer amazing performance at a good price. I have used these bottoms to layer under fleece pants and hard shell bibs or breathable waders in temperatures down to -12 F. When appropriately layered, they are unbeatable in the duck blind or on stand in the winter. As a tall person, I like that the sizing covers long legs and long legs without any gaps around the waist, even when bending over. In addition to be warming, they are durable and suitable for outdoor adventures. I took two top/bottom sets to Alaska for a two-week rafting trip this summer and I was comfortable, even when it rained for four days. 10/10. But with confidence…and buy the zip top while you are at it.

### ⭐⭐⭐⭐⭐ The last thermals you’ll ever need!
*by T***Y on December 3, 2025*

Same thing issued to the US military.Comfortable material. Rated for -40°F. Worth every penny.

### ⭐⭐⭐⭐⭐ Keeps you warm and comfy
*by J***N on March 18, 2025*

Warm and cheap. These are an essential mid layer for anything below 0F

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-02-07*