---
product_id: 34464746
title: "Rothco ECWCS Gen III Mid-Weight Underwear Bottoms - Insulated Cold Weather Base Layer"
price: "¥15348"
currency: JPY
in_stock: true
reviews_count: 8
url: https://www.desertcart.jp/products/34464746-rothco-ecwcs-gen-iii-mid-weight-underwear-bottoms-insulated-cold
store_origin: JP
region: Japan
---

# Moisture-wicking quick-dry tech Mid-weight grid fleece insulation Flexible polyester/spandex blend Rothco ECWCS Gen III Mid-Weight Underwear Bottoms - Insulated Cold Weather Base Layer

**Price:** ¥15348
**Availability:** ✅ In Stock

## Summary

> ❄️ Own the cold, don’t let it own you!

## Quick Answers

- **What is this?** Rothco ECWCS Gen III Mid-Weight Underwear Bottoms - Insulated Cold Weather Base Layer
- **How much does it cost?** ¥15348 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/34464746-rothco-ecwcs-gen-iii-mid-weight-underwear-bottoms-insulated-cold)

## 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

- • **Layer Like a Pro:** Pairs perfectly with matching ECWCS Gen III tops for unbeatable cold-weather defense
- • **Sweat? What Sweat?:** Advanced moisture-wicking keeps you dry and comfortable all day
- • **Move Like You Mean It:** Stretchy grid fleece fabric flexes with every move—no restrictions
- • **Tactical-Grade Comfort:** Elastic waistband and access fly designed for active-duty precision
- • **Engineered for Arctic Endurance:** Stay warm down to -40°F with military-grade insulation

## Overview

Rothco ECWCS Gen III Mid-Weight Underwear Bottoms are military-issued, insulated base layers crafted from breathable polyester/spandex grid fleece. Designed for extreme cold down to -40°F, they wick moisture away to keep you dry and feature a flexible fit with an elastic waistband and access fly. Ideal for tactical professionals and outdoor enthusiasts seeking reliable warmth and comfort in harsh winter conditions.

## Description

Buy Rothco ECWCS Gen III Mid-Weight Underwear Bottoms (Level II) - Dominate The Elements, Coyote Brown - L: Pants - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Cold weather gear - Fit is spot on,great item .Warm and comfortable!
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 |
|---------------|-------|
| Care instructions | Machine Wash |
| Closure type | Elastic |
| Fabric type | Polyester Spandex |
| Origin | Imported |

## Images

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

## Available Options

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

## Questions & Answers

**Q: What size for a 5'4" 125 female**
A: I would probably go with a small, or a medium, depending on how much weight you cary in your legs. I'm 5'9 200 and the large fit me well, but I have thicker thighs.

**Q: Can anyone tell me the length of the XS ?  My son is extremely slim and about 5’8...  he is about a 26/27 waist.. small would be to big in my opinion**
A: XS should fit.

**Q: I'm 6,2 170pds should i get the large or x-large?**
A: I'm 5,8 205pds and the large fit fine except they were about 4 inches too long for my height.

**Q: My husband is 6'4" and 220lbs what size should I get?**
A: Husband is 5'6 180 lbs got a large, so either xl or xxl

## Customer Reviews

### ⭐⭐⭐⭐⭐ Cold weather gear
*by P***R on January 30, 2026*

Fit is spot on,great item .Warm and comfortable!

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ 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.

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**Shop now:** [https://www.desertcart.jp/products/34464746-rothco-ecwcs-gen-iii-mid-weight-underwear-bottoms-insulated-cold](https://www.desertcart.jp/products/34464746-rothco-ecwcs-gen-iii-mid-weight-underwear-bottoms-insulated-cold)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-03-10*