---
product_id: 621775071
title: "Reactor Insulated Sleeping Bag Liner"
brand: "sea to summit"
price: "€ 123.21"
currency: EUR
in_stock: true
reviews_count: 13
category: "Sea To Summit"
url: https://www.desertcart.gr/products/621775071-reactor-insulated-sleeping-bag-liner
store_origin: GR
region: Greece
---

# Thermolite Pro heat retention Adjustable drawcord footbox Extreme compact & lightweight Reactor Insulated Sleeping Bag Liner

**Brand:** sea to summit
**Price:** € 123.21
**Availability:** ✅ In Stock

## Summary

> 🔥 Sleep smarter, not colder — your ultimate warmth hack for every adventure!

## Quick Answers

- **What is this?** Reactor Insulated Sleeping Bag Liner by sea to summit
- **How much does it cost?** € 123.21 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/621775071-reactor-insulated-sleeping-bag-liner)

## Best For

- sea to summit enthusiasts

## Why This Product

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

## Key Features

- • **Freedom to Move:** Knitted, stretchy mummy shape offers unrestricted movement while enhancing sleeping bag compatibility.
- • **Next-Level Warmth:** Thermolite Pro fibers reflect your body heat for cozy nights even in chilly spring temps.
- • **Stay Fresh Longer:** HeiQ Fresh odor control technology keeps your liner smelling clean after multiple adventures.
- • **Custom Comfort Fit:** Drawcord footbox lets you dial in perfect ventilation or snug warmth, syncing seamlessly with Sea to Summit’s Free-Flow Zip system.
- • **Pack Light, Sleep Tight:** Ultra-compact design fits effortlessly in your backpack without weighing you down at just 0.81 lbs.

## Overview

The Sea to Summit Reactor Insulated Sleeping Bag Liner uses advanced Thermolite Pro hollow-core fibers and infrared ceramic pigments to reflect body heat, providing enhanced warmth in a lightweight, compact design. Featuring an adjustable drawcord footbox compatible with Sea to Summit’s Free-Flow Zip system and HeiQ Fresh odor control, this stretchy mummy-shaped liner ensures comfort, hygiene, and freedom of movement for 3-season outdoor enthusiasts.

## Description

desertcart.com : Sea to Summit Reactor Sleeping Bag Liner, Extreme Compact (78 x 31.5) : Sports & Outdoors

Review: I like it - Lightweight, warm, comfortable
Review: Great liner for summer months - i’m not keeping this because I need something a little warmer. I’m getting ready to start the Appalachian Trail and I just don’t think this is warm enough for me looking for a warmer insulated liner for my sleeping bag. If I wouldn’t be hiking in the cold, I probably would’ve kept it.

## Features

- thermolite
- Imported
- Insulated sleeping bag liner adds extra warmth and personal hygiene to any sleeping bag.
- Thermolite Pro technology using knitted, hollow-core fibers and absorbing infrared ceramic pigments to reflect your body's heat back to the wearer for enhanced warmth and comfort
- Drawcord footbox can be opened or closed for optimal comfort and integrates perfectly with the footbox of our Free-Flow Zip system in select Sea to Summit sleeping bags
- HeiQ Fresh odor control technology helps keep the liner fresh even after extended use
- Knitted fabric provides incredible stretch and freedom of movement in this mummy-shaped liner and works seamlessly with sleeping bags of any shape, Sea to Summit Guarantee is offered for the Lifetime of this product

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CT67MSSN |
| Age Range (Description) | Adult |
| Best Sellers Rank | #9,324 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #4 in Camping Sleeping Bag Liners |
| Brand | Sea to Summit |
| Brand Name | Sea to Summit |
| Closure Type | Drawstring |
| Country of Origin | China |
| Customer Reviews | 4.7 4.7 out of 5 stars (239) |
| Date First Available | January 24, 2024 |
| Fabric Type | thermolite |
| Fill Material | Thermolite hollow-core fibers |
| Fill Material Type | Thermolite hollow-core fibers |
| Global Trade Identification Number | 09327868158317 |
| Item Dimensions LxWxH | 85 x 31.5 x 3 inches |
| Item Package Dimensions L x W x H | 8.5 x 4.8 x 3.86 inches |
| Item Weight | 0.81 Pounds |
| Manufacturer | Sea to Summit |
| Material | thermolite |
| Maximum Height Recommendation | 7 Feet |
| Occupancy | 1 Person |
| Outer Material | thermolite |
| Package Weight | 0.37 Kilograms |
| Part Number | SS42100 |
| Seasons | 3 Seasons, Spring |
| Shape | Mummy |
| Size | 78 x 31.5 |
| Sport | Mountaineering, Climbing, Backpacking, Hiking |
| Style | Extreme Compact (78 X 31.5) |
| Suggested Users | unisex, all ages |
| Temperature Rating | Designed for temperatures down to 25 degrees Fahrenheit below user's comfort range |

## Product Details

- **Age Range (Description):** Adult
- **Brand:** Sea to Summit
- **Closure Type:** Drawstring
- **Fill Material:** Thermolite hollow-core fibers
- **Material:** thermolite
- **Occupancy:** 1 Person
- **Seasons:** 3 Seasons, Spring
- **Shape:** Mummy
- **Sport:** Mountaineering, Climbing, Backpacking, Hiking
- **Temperature Rating:** Designed for temperatures down to 25 degrees Fahrenheit below user's comfort range

## Images

![Reactor Insulated Sleeping Bag Liner - Image 1](https://m.media-amazon.com/images/I/51qJoRiUJpL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ I like it
*by K***R on November 21, 2025*

Lightweight, warm, comfortable

### ⭐⭐⭐⭐⭐ Great liner for summer months
*by C***R on January 7, 2026*

i’m not keeping this because I need something a little warmer. I’m getting ready to start the Appalachian Trail and I just don’t think this is warm enough for me looking for a warmer insulated liner for my sleeping bag. If I wouldn’t be hiking in the cold, I probably would’ve kept it.

### ⭐⭐⭐⭐⭐ Versatile and effective both as a warmth-increasing line and as a standalone bag
*by J***K on June 28, 2025*

I bought this to store in my camper as a 'just in case' item or spare, and have been very pleased with it. It definitely adds warmth to a main sleeping bag without making one feel clammy inside, and it works nicely as a light bag on warmer nights. The open footbox adds further versatility (you can close it with a drawstring for maximum warmth) too. If you're through-hiking the AT, it's too bulky and heavy to justify taking along, but if you do RV camping or are going out for one or two nights and expect variable weather, this is a very worthwhile addition to your kit.

---

## 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.gr/products/621775071-reactor-insulated-sleeping-bag-liner](https://www.desertcart.gr/products/621775071-reactor-insulated-sleeping-bag-liner)

---

*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-03-04*