--- product_id: 621775071 title: "Reactor Insulated Sleeping Bag Liner" brand: "sea to summit" price: "€ 126.67" currency: EUR in_stock: true reviews_count: 12 url: https://www.desertcart.be/products/621775071-reactor-insulated-sleeping-bag-liner store_origin: BE region: Belgium --- # Ultra-light 13 oz weight Up to +32°F warmth boost Stretch-knit Thermolite fabric Reactor Insulated Sleeping Bag Liner **Brand:** sea to summit **Price:** € 126.67 **Availability:** ✅ In Stock ## Summary > 🔥 Sleep warmer, move freer, camp smarter. ## Quick Answers - **What is this?** Reactor Insulated Sleeping Bag Liner by sea to summit - **How much does it cost?** € 126.67 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/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 - • **Lifetime Guarantee:** Invest in gear that lasts—Sea to Summit backs your liner for life, because quality matters. - • **Freedom of Movement:** Stretch-knit mummy shape fabric offers unmatched comfort and fits any sleeping bag seamlessly. - • **Odor-Control Technology:** HeiQ Fresh keeps your liner smelling clean and fresh, even after extended adventures. - • **Versatile Drawcord Footbox:** Adjust ventilation or walk around camp without removing your liner—comfort meets convenience. - • **Thermolite Pro Warmth Boost:** Add up to 32°F of cozy heat to your sleep system—never compromise on cold nights. ## Overview The Sea to Summit Reactor Insulated Sleeping Bag Liner uses advanced Thermolite Pro hollow-core fibers with infrared ceramic pigments to reflect body heat, adding up to 32°F of warmth. Its stretch-knit fabric ensures a perfect fit and freedom of movement, while the adjustable drawcord footbox enhances ventilation and mobility. Lightweight at just 13 ounces, it features HeiQ Fresh odor control for lasting freshness and comes with a lifetime guarantee, making it an essential upgrade for any serious camper seeking warmth, hygiene, and versatility. ## Description Ultra-portable camp kitchen gear includes lightweight and collapsible cookware, dinnerware, utensils and more. Sleeping pads, bags, liners, and pillows . . . when you're weighing your options, the most important factor is the value of a great night's sleep. Space-saving stuff sacks and dry bags keep your camping gear dry and protected. Stay organized, easily access what you need, and keep on trekking. Our collection of travel and outdoor accessories features a wide range of must-haves for organized, adventures. Thermal boost liner retains heat, adds warmth to your sleep system in colder conditions, and acts as a hygienic layer to extend the life of your sleeping bag. Reactor Bag Liner Comfort Blend Bag Liner Ether Light XT Pad Comfort Light Pad Pursuit Self-Inflating Boab Sleeping Bag Spark Pro Sleeping Bag 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. ## 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 | |---------------|-------| | Additional Features | Lightweight | | Age Range Description | Adult | | Asin | B0CT67MSSN | | Best Sellers Rank | #15,625 in Sports & Outdoors (See Top 100 in Sports & Outdoors) #8 in Camping Sleeping Bag Liners | | Brand Name | Sea to Summit | | Closure Type | Drawcord | | Color | Lime or Royal Blue | | Customer Reviews | 4.8 4.8 out of 5 stars (53) 4.8 out of 5 stars | | Fabric Type | thermolite | | Fill Material Type | Thermolite hollow-core fibers | | Global Trade Identification Number | 09327868158317 | | Item Dimensions L X W | 85"L x 31.5"W | | Item Weight | 12.96 ounces | | Manufacturer | Sea to Summit | | Manufacturer Part Number | SS42100 | | Material | Synthetic | | Maximum Height Recommendation | 7 feet | | Model Number | SS42100 | | Number Of Items | 1 | | Occupancy | 1 Person | | Seasons | All Seasons | | Shape | Mummy | | Shellmaterial | thermolite | | Size | Compact | | Sport Type | Camping & Hiking | | Temperature Rating | Designed for temperatures down to 25 degrees Fahrenheit below user's comfort range | | Unit Count | 1 count | ## Product Details - **Age Range (Description):** Adult - **Brand:** Sea to Summit - **Color:** Lime or Royal Blue - **Material:** Synthetic - **Occupancy:** 1 Person - **Seasons:** All Seasons - **Shape:** Mummy - **Special Feature:** Lightweight - **Sport:** Camping & 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) ![Reactor Insulated Sleeping Bag Liner - Image 2](https://m.media-amazon.com/images/I/717FGa+RshL.jpg) ![Reactor Insulated Sleeping Bag Liner - Image 3](https://m.media-amazon.com/images/I/7142moFOpHL.jpg) ![Reactor Insulated Sleeping Bag Liner - Image 4](https://m.media-amazon.com/images/I/81XnJwN4QUL.jpg) ![Reactor Insulated Sleeping Bag Liner - Image 5](https://m.media-amazon.com/images/I/818yJJioawL.jpg) ## Available Options This product comes in different **Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Extra warmth for minimal weight *by on Reviewed in the United States February 23, 2025* I used this during a recent 3 day competition where we had to carry all of our gear and camp outside. Winter storm was predicted so I got this to bolster my sleeping bag. It got down into the teens and we had 5”+ of snow one night. This definitely helped keep me warm, especially sleeping on an ultralight foam pad.Packs down small and doesn’t weigh too much for the warmth it provides.Probably way overpriced for what it is (someone with basic sewing skills could probably make this for half the price), but if you need some extra insulation that doesn’t get too much in the way of sleeping, this is a good purchase. ### ⭐⭐⭐⭐⭐ Would highly recommend for backpacking *by on Reviewed in the United States August 12, 2026* Very satisfied with this purchase. Worth the price because it serves dual purposes so displaces other heavy gear in a backpack - camp blanket around the fire, sleep liner on chilly nights for extra warmth, and summer sleep sack for overnights in hot weather when you don't need a heavy bag. ### ⭐⭐⭐⭐⭐ I like it *by on Reviewed in the United States November 21, 2025* Lightweight, warm, comfortable --- ## 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.be/products/621775071-reactor-insulated-sleeping-bag-liner](https://www.desertcart.be/products/621775071-reactor-insulated-sleeping-bag-liner) --- *Product available on Desertcart Belgium* *Store origin: BE* *Last updated: 2026-08-21*