Sea to Summit

Reactor Extreme Liner (adds up to 15°C)

Sale price$90.00
Only 2 units left

Introducing the Reactor Extreme Liner by Sea To Summit, the ultimate companion for extreme outdoor adventures. Engineered with cutting-edge technology, this liner adds up to 15°C of extra warmth to your sleeping bag, ensuring a cozy and comfortable night's sleep even in the harshest conditions. Whether you're trekking through snowy peaks or camping in freezing temperatures, the Reactor Extreme Liner is designed to provide unparalleled insulation and heat retention. Upgrade your outdoor gear with this essential accessory and conquer the Great Outdoors with confidence.


  • Adds up to 15°C of extra warmth to your sleeping bag
  • Lightweight and compact design for easy portability
  • Made from premium materials for enhanced durability
  • Excellent heat retention properties for optimal insulation
  • Ergonomic shape with ample room for comfortable movement
  • Easy to clean and maintain
  • Versatile use: can be used on its own or as a liner in a sleeping bag
Material: High-quality synthetic fabric
Weight: 350 grams
Dimensions (unrolled): 210cm x 90cm
Dimensions (packed): 12cm x 18cm
Insulation: 100g/m² Thermolite fabric
Temperature Rating: Adds up to 15°C to the temperature rating of your sleeping bag
Features: Mummy-shaped design, drawcord hood, quarter-length zipper

We offer free delivery on all orders over €75, and €5.95 for all orders under €75.
 -We aim to ship all orders placed before 3:00pm on the same business day and have it delivered next-day, but in busy periods can take longer, so allow for up to 3 business days.

We accept returns within 30 days of receiving the item, either in-store or by post.
- All items returned must be suitable to be sold again as new.
- All returns can be organised with An Post click & post, and will be fulfilled as soon as they arrive back at our store. Click here to start a return

At Great Outdoors, we understand the need for groups, companies and individuals to order products in bulk. Whether you are looking for a gift for your hardworking crew, jackets to outfit your dedicated sales team, or anything else that may come to mind - we would love to help!

Simply contact Paul from our corporate team, contacted at with any enquiry, big or small and we will do our very best to get the right items at the right price!

Same day delivery to Dublin

Free Delivery
To all 32 counties on orders over €75.00

Over 5000 Satisfied customers

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Shipping & Returns

Great Outdoors ships throughout the EU via An Post & National Carriers. Orders over €75 qualify for Free Next-Day Shipping in Ireland, otherwise, a flat rate of €5.95 will be charged per order under €75, for Next-Day shipping. We will aim to ship orders placed Monday - Friday before 12:00 pm the same day, although this is not guaranteed.

Orders placed on weekends will ship on the following Monday. Courier speed is conistent and we try our best to give our customers the best delivery service, but delays are out of our hands so we allow for 3 days of delivery.

For more information regarding shipping, including shipping charges and estimated delivery times, please contact us.

If you are unhappy with your purchase, please return it to us within 28 days of receipt. The item(s) must be in resalable condition with tags attached. We accept exchanges for items but that must be communicated to our team and is subject to stock availability.

Please note, we are not able to accept returns for underwear unless the product is faulty or damaged. We advise that you use a recorded courier service to return your item(s) as we cannot be responsible for items lost in the post.

For more information regarding returns and warranty, please contact us.