---
product_id: 441576705
title: "NEMO Equipment Sonic Down Mummy Sleeping Bag"
brand: "nemo equipment"
price: "$1510.22"
currency: USD
in_stock: true
reviews_count: 4
category: "Nemo Equipment"
url: https://www.desertcart.us/products/441576705-nemo-equipment-sonic-down-mummy-sleeping-bag
store_origin: US
region: United States of America
---

# Next-gen Thermo Gill vents with multistage zipper 100% recycled, bluesign approved fabrics 800 FP hydrophobic down for extreme warmth NEMO Equipment Sonic Down Mummy Sleeping Bag

**Brand:** nemo equipment
**Price:** $1510.22
**Availability:** ✅ In Stock

## Summary

> ❄️ Sleep Warm, Sleep Smart — The Future of Cold-Weather Camping

## Quick Answers

- **What is this?** NEMO Equipment Sonic Down Mummy Sleeping Bag by nemo equipment
- **How much does it cost?** $1510.22 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/441576705-nemo-equipment-sonic-down-mummy-sleeping-bag)

## Best For

- nemo equipment enthusiasts

## Why This Product

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

## Key Features

- • **Eco-Conscious Performance:** Crafted entirely from 100% recycled, bluesign approved nylon shell and liner fabrics—sleep sustainably without compromise.
- • **Ergonomic Fit & Durability:** Stretch construction at the knees, draft collars, and a waterproof/breathable footbox deliver all-night comfort and protection on rugged adventures.
- • **Adaptive Ventilation System:** Next-generation Thermo Gill vents with a multistage zipper let you fine-tune airflow for comfort across fluctuating temperatures.
- • **Innovative Chevron Baffle Design:** Chevron baffles prevent down migration, ensuring consistent loft and warmth throughout the night.
- • **Unmatched Warmth in Extreme Cold:** Stay toasty down to -20°F with premium 800 FP hydrophobic down that repels moisture and locks in heat.

## Overview

The NEMO Equipment Sonic Down Mummy Sleeping Bag is an award-winning, ultralight winter sleeping bag engineered for extreme cold down to -20°F. Featuring premium 800 FP hydrophobic down certified by the Responsible Down Standard, it combines sustainable 100% recycled nylon fabrics with advanced Thermo Gill ventilation and chevron baffle construction for superior warmth retention and customizable comfort. Designed for serious mountaineers and trekkers, it offers ergonomic stretch zones, draft collars, and a waterproof footbox, all backed by a lifetime warranty.

## Description

desertcart.com : NEMO Equipment Sonic Down Mummy Sleeping Bag -20°F/Regular | Ultralight, Insulated, Made for Extreme Cold, Mountaineering, Trekking : Sports & Outdoors

Review: worth the money - Nice and toasty, just a great design.
Review: zipper problems - Nice and warm at +23 degrees F and windy. The zipper was sticky and jammed the first trip. Brought it home and unstuck it with great force. The next trip I had the same zipper issues so I had to return it. Too bad, it's a really nice bag with plenty of room for me.

## Features

- Nylon
- Award-winning design updated for even greater warmth retention and adjustability across temperatures.
- Constructed with 100% recycled, bluesign approved shell and liner fabrics.
- Second-generation Thermo Gill vents extend the comfort range with a new multistage zipper system.
- Overstuffed with premium 800 FP hydrophobic down that is PFC-Free and 100% Responsible Down Standard (RDS) certified, ensuring humane treatment and traceability throughout the supply chain.
- Chevron baffle construction better compartmentalizes down for more uniform loft and down migration prevention.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09RN9L16W |
| Additional Features | Next-generation Thermo Gills, Chevron baffle construction, Updated profile, Stretch construction at the knees, Draft collar and draft tubes, Toester waterproof/breathable footbox |
| Age Range Description | Adult |
| Best Sellers Rank | #462,464 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #731 in Camping Sleeping Bags |
| Brand | NEMO Equipment |
| Brand Name | NEMO Equipment |
| Closure Type | Zipper |
| Color | Goodnight Gray / Torch |
| Customer Reviews | 4.3 out of 5 stars 14 Reviews |
| Fabric Type | Nylon |
| Fill Material Type | Down |
| Item Dimensions L x W | 77.95"L x 31.5"W |
| Item Weight | 1.76 kg |
| Manufacturer | Nemo Equipment |
| Manufacturer Part Number | 811666034540 |
| Material | Nylon |
| Maximum Height Recommendation | 72 inches |
| Model Number | NM-SNC3-R |
| Occupancy | 1 Person |
| Seasons | Winter |
| Shape | Mummy |
| ShellMaterial | Polycarbonate |
| Size | Standard |
| Sport Type | Camping |
| Temperature Rating | Extreme |
| UPC | 811666034540 |
| Warranty Description | Every NEMO Product is backed by a lifetime warranty against defects in workmanship and materials. |

## Product Details

- **Age Range (Description):** Adult
- **Brand:** NEMO Equipment
- **Color:** Goodnight Gray / Torch
- **Material:** Nylon
- **Occupancy:** 1 Person
- **Seasons:** Winter
- **Shape:** Mummy
- **Sport:** Camping
- **Temperature Rating:** Extreme

## Images

![NEMO Equipment Sonic Down Mummy Sleeping Bag - Image 1](https://m.media-amazon.com/images/I/61BzIEOmwEL.jpg)
![NEMO Equipment Sonic Down Mummy Sleeping Bag - Image 2](https://m.media-amazon.com/images/I/816uz6Wvn5L.jpg)
![NEMO Equipment Sonic Down Mummy Sleeping Bag - Image 3](https://m.media-amazon.com/images/I/81Q9NhsEcpL.jpg)
![NEMO Equipment Sonic Down Mummy Sleeping Bag - Image 4](https://m.media-amazon.com/images/I/81POWmAVTIL.jpg)
![NEMO Equipment Sonic Down Mummy Sleeping Bag - Image 5](https://m.media-amazon.com/images/I/51PCCZGODKL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ worth the money
*by I***R on July 9, 2025*

Nice and toasty, just a great design.

### ⭐⭐⭐ zipper problems
*by R***S on April 15, 2022*

Nice and warm at +23 degrees F and windy. The zipper was sticky and jammed the first trip. Brought it home and unstuck it with great force. The next trip I had the same zipper issues so I had to return it. Too bad, it's a really nice bag with plenty of room for me.

### ⭐⭐ Top-of-the-line sleeping bag
*by J***. on October 17, 2024*

I am an avid outdoorsman. I really like this sleeping bag Haven’t been below 5° yet but done well at 5° And above I stay Toasty. I’m 6 foot tall 195 pounds and there’s plenty of room for a comfortable nights Sleep

## Frequently Bought Together

- NEMO Equipment Sonic Down Mummy Sleeping Bag
- NEMO Equipment Switchback Foam Sleeping Pad

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-08-01*