---
product_id: 666660107
title: "Reactor Sleeping Bag Liner, Extreme Standard (85 x 31.5)"
brand: "sea to summit"
price: "€ 242.39"
currency: EUR
in_stock: true
reviews_count: 5
category: "Sea To Summit"
url: https://www.desertcart.gr/products/666660107-reactor-sleeping-bag-liner-extreme-standard-85-x-31-5
store_origin: GR
region: Greece
---

# Up to +25°F warmth boost Stretch-knit Thermolite Pro fabric Adjustable drawcord footbox Reactor Sleeping Bag Liner, Extreme Standard (85 x 31.5)

**Brand:** sea to summit
**Price:** € 242.39
**Availability:** ✅ In Stock

## Summary

> 🔥 Sleep warmer, move freer, camp smarter.

## Quick Answers

- **What is this?** Reactor Sleeping Bag Liner, Extreme Standard (85 x 31.5) by sea to summit
- **How much does it cost?** € 242.39 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/666660107-reactor-sleeping-bag-liner-extreme-standard-85-x-31-5)

## 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:** Stretch-knit mummy shape fabric ensures unrestricted comfort and perfect fit with any sleeping bag.
- • **Lifetime Guarantee:** Backed by Sea to Summit’s lifetime promise—gear that’s as reliable as your next expedition.
- • **Ventilated Footbox:** Drawcord footbox lets you regulate warmth or step out without losing heat—camp life, upgraded.
- • **Odor-Control Freshness:** HeiQ Fresh technology keeps your liner smelling clean even after extended adventures.
- • **Thermolite Pro Warmth Boost:** Add up to 25°F of cozy heat to your sleep system—never compromise on cold nights.

## Overview

The Sea to Summit Reactor Extreme Sleeping Bag Liner uses advanced Thermolite Pro hollow-core fibers with infrared ceramic pigments to reflect body heat, adding up to 25°F of warmth. Its stretch-knit mummy design fits any sleeping bag, while the adjustable drawcord footbox offers ventilation and mobility. Enhanced with HeiQ Fresh odor control and backed by a lifetime guarantee, this lightweight 0.38 kg liner elevates your outdoor sleep experience across all seasons.

## Description

Sea to Summit Reactor series insulated sleeping bag liners can extend the comfort range and improve personal hygiene of any sleeping bag. Thermolite hollow core fibers are constructed like the fur of a polar bear, efficiently trapping heat and providing a luxuriously soft, comfortable feel. The stretch-knit fabric provides optimal comfort, and ensures the Reactor fits any sleeping bag. Additionally, the drawcord footbox offers plenty of ventilation and the versatility of walking around camp while still wearing your liner. Available in three different weights, Reactor technical liners make your existing sleeping bag warmer and more versatile. The Regular Liner uses hollow-core Thermolite Pro fabric with infra red-absorbing ceramic pigments and Thermolite EcoMade fibers. This lightweight fabric adds up to 14F of warmth to your sleep system. The Extreme Liner features a thicker hollow-core Thermolite Pro fabric to add up to 25F of warmth to your sleep system. The Fleece Liner employs hollow-core Thermolite Pro fibers in a grid-pattern to deliver our warmest sleeping bag liner which adds up to 32F of warmth to your sleep system.

Review: Klein aber fein - Das Ding ist echt warm. Ob als Zusatz in kalten Gebieten oder als Haupt Schlafsack in passenden Temperaturen. Kann man machen 👍 ich finde vor allem die Öffnung unten auch sehr gut, dann kann man doch auch mal bei Kälte raus und verschwendet nicht gleich die ganze Wärme :D die Größe(ist klein) und das Gewicht ist es mir auch Wert es mitzunehmen. Bei richtiger Kälte ist nicht zu spaßen.
Review: Buen Producto - No lo he utilizado todavía pero cumple con la descripción

## Features

- 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 | B0CT69SWJP |
| Age Range Description | Adult |
| Best Sellers Rank | #122,492 in Sports, Fitness & Outdoors ( See Top 100 in Sports, Fitness & Outdoors ) #12 in Sleeping Bag Liners |
| Brand | Sea to Summit |
| Brand Name | Sea to Summit |
| Closure Type | Drawstring |
| Colour | Orange |
| Customer Reviews | 4.4 out of 5 stars 107 Reviews |
| Fabric Type | thermolite |
| Fill Material Type | Thermolite |
| Global Trade Identification Number | 09327868158331 |
| Item Shape | Mummy |
| Item Weight | 0.38 Kilograms |
| Manufacturer | Sea to Summit |
| Manufacturer Part Number | ASL031071-190804 |
| Material | thermolite |
| Model Number | ASL031071-190804 |
| Occupancy | 1 |
| Outer Material Type | thermolite |
| Season | All Seasons |
| Seasons | All Seasons |
| Shape | Mummy |
| Size | 85 x 31.5 |
| Temperature Rating | 6 to 15 degrees Celsius |

## Product Details

- **Brand:** Sea to Summit
- **Colour:** Orange
- **Occupancy:** 1
- **Seasons:** All Seasons
- **Shape:** Mummy

## Images

![Reactor Sleeping Bag Liner, Extreme Standard (85 x 31.5) - Image 1](https://m.media-amazon.com/images/I/51y1ZEIIHRL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Klein aber fein
*by A***N on 28 April 2026*

Das Ding ist echt warm. Ob als Zusatz in kalten Gebieten oder als Haupt Schlafsack in passenden Temperaturen. Kann man machen 👍 ich finde vor allem die Öffnung unten auch sehr gut, dann kann man doch auch mal bei Kälte raus und verschwendet nicht gleich die ganze Wärme :D die Größe(ist klein) und das Gewicht ist es mir auch Wert es mitzunehmen. Bei richtiger Kälte ist nicht zu spaßen.

### ⭐⭐⭐⭐⭐ Buen Producto
*by Y***N on 2 October 2025*

No lo he utilizado todavía pero cumple con la descripción

### ⭐⭐ Mi aspettavo di più
*by A***I on 23 November 2024*

Ho utilizzato questo supporto per 7 giorni in un campo scout i primi di novembre '24 con una temperatura notturna esterna di 10°C circa ma molta umidità, zona VT. Utlizzata con sacco a pelo nuovo con temperatura comfort +5°C , tenda invernale e ben isolata. Premetto che ahimè sono una persona molto freddolosa,ma nonostante i doppi strati di intimo termico,pantaloni di pile,maglia di lana e maglia di pile la notte ho sempre avuto freddo. Il materiale si lega con gli altri tessuti per cui limita i movimenti. Pro:facile da piegare,compatto e leggero. Si lava bene in lavatrice e non stinge. Sicuramente lo userò nelle route estive al posto del sacco a pelo o sacco lenzuolo ma in inverno tutta questa differenza di comfort termico non l'ho vista. Peccato perché l'azienda ha sempre ottimi prodotti.

## Frequently Bought Together

- Sea to Summit Reactor Insulated Sleeping Bag Liner
- Sea to Summit Drylite Towel, Lightweight Camping and Travel Towel
- Rainleaf Microfiber Towel Perfect Travel & Gym & Camping Towel. Quick Dry - Super Absorbent - Ultra Compact - Lightweight. Suitable for Trip, Beach, Shower, Backpacking, Pool

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**Shop now:** [https://www.desertcart.gr/products/666660107-reactor-sleeping-bag-liner-extreme-standard-85-x-31-5](https://www.desertcart.gr/products/666660107-reactor-sleeping-bag-liner-extreme-standard-85-x-31-5)

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*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-09-30*