---
product_id: 621775071
title: "Reactor Insulated Sleeping Bag Liner"
brand: "sea to summit"
price: "453 zł"
currency: PLN
in_stock: true
reviews_count: 8
category: "Sea To Summit"
url: https://www.desertcart.pl/products/621775071-reactor-insulated-sleeping-bag-liner
store_origin: PL
region: Poland
---

# HeiQ Fresh odor control Thermolite Pro heat retention Drawcord footbox adjustable fit Reactor Insulated Sleeping Bag Liner

**Brand:** sea to summit
**Price:** 453 zł
**Availability:** ✅ In Stock

## Summary

> 🔥 Sleep warmer, fresher, and freer—upgrade your nights under the stars!

## Quick Answers

- **What is this?** Reactor Insulated Sleeping Bag Liner by sea to summit
- **How much does it cost?** 453 zł with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/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:** Stretchy knitted fabric adapts to your shape and sleeping bag style for unrestricted comfort.
- • **Next-Level Warmth:** Thermolite Pro fibers reflect your body heat for unbeatable insulation down to 25°F.
- • **Custom Comfort Fit:** Drawcord footbox lets you dial in perfect warmth and pairs seamlessly with Sea to Summit Free-Flow zips.
- • **Lifetime Confidence:** Backed by Sea to Summit’s lifetime guarantee—your ultimate adventure companion.
- • **Stay Fresh, Sleep Clean:** HeiQ Fresh technology keeps odors at bay, so your liner feels like new trip after trip.

## 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, enhancing warmth in temperatures as low as 25°F. Featuring an adjustable drawcord footbox compatible with Sea to Summit’s Free-Flow Zip system, HeiQ Fresh odor control, and a stretchy mummy-shaped design, it offers superior comfort, hygiene, and durability backed by a lifetime guarantee.

## Description

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

Review: Warm and comfortable. - Kept me pretty warm with my 32F down sleeping bag in 25F weather. My feet got a little cold but wasn’t bad enough to keep me up all night.
Review: It worked for me! - First night was in the 20’s f and worked great with my sleep system. I woke up to a small amount of snow and was warm without feeling drafts in my hammock. I use this every time in my sleep system

## 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 |
| Age Range Description | Adult |
| Best Sellers Rank | #16,945 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #8 in Camping Sleeping Bag Liners |
| Brand | Sea to Summit |
| Brand Name | Sea to Summit |
| Closure Type | Drawstring |
| Customer Reviews | 4.7 out of 5 stars 255 Reviews |
| Fabric Type | thermolite |
| Fill Material Type | Thermolite hollow-core fibers |
| Global Trade Identification Number | 09327868158317 |
| Item Weight | 12.96 ounces |
| Manufacturer | Sea to Summit |
| Manufacturer Part Number | SS42100 |
| Material | thermolite |
| Maximum Height Recommendation | 7 Feet |
| Model Number | SS42100 |
| Occupancy | 1 Person |
| Seasons | 3 Seasons, Spring |
| Shape | Mummy |
| ShellMaterial | thermolite |
| Size | 78 x 31.5 |
| Sport Type | Mountaineering, Climbing, Backpacking, Hiking |
| Temperature Rating | Designed for temperatures down to 25 degrees Fahrenheit below user's comfort range |
| Unit Count | 1.0 Count |

## 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)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Warm and comfortable.
*by J***K on February 10, 2026*

Kept me pretty warm with my 32F down sleeping bag in 25F weather. My feet got a little cold but wasn’t bad enough to keep me up all night.

### ⭐⭐⭐⭐⭐ It worked for me!
*by W***N on January 29, 2026*

First night was in the 20’s f and worked great with my sleep system. I woke up to a small amount of snow and was warm without feeling drafts in my hammock. I use this every time in my sleep system

### ⭐⭐⭐⭐⭐ 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.

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**Shop now:** [https://www.desertcart.pl/products/621775071-reactor-insulated-sleeping-bag-liner](https://www.desertcart.pl/products/621775071-reactor-insulated-sleeping-bag-liner)

---

*Product available on Desertcart Poland*
*Store origin: PL*
*Last updated: 2026-05-12*