Sea to Summit Reactor Lightweight Sleeping Bag Liner - Mummy

  • From £34.95
  • (Delivery from £4.00 )
  • RRP £45.00
Loading...
Item in Stock   |   Usually dispatched within 24 hours
Delivery Options Available
Standard 3-5 Working Days Available
Estimated delivery date: Tue 13th October - Thu 15th October
Express 1-2 Working Days Available
Estimated delivery date: Mon 12th October - Tue 13th October
Newsletter Signup
  • From £34.95
  • (Delivery from £4.00 )
  • RRP £45.00

The Sea to Summit Reactor Lightweight Liner adds extra warmth to your sleeping bag with minimal weight.

Built for versatility and comfort, it features stretch-knit Thermolite® Pro fabric that moves with you as you sleep, while integrated armholes provide complete freedom of movement for unrestricted rest. The liner fits easily inside any sleeping bag and snaps into compatible Sea to Summit bags for secure placement and effortless entry and exit.

Using Far Infrared (FIR) technology and hollow-core fibres, Thermolite® Pro traps and reflects body heat, boosting warmth by up to 4 °C | 7 °F without adding bulk or weight. With HeiQ Fresh odour control and quick-drying performance, the Reactor Lightweight Liner stays fresh and low-maintenance on extended trips. It also helps prolong your sleeping bag’s lifespan by reducing washing frequency, keeping insulation loft and performance intact longer.

Features

  • Freedom to Move: Stretch-knit construction and armholes allow unrestricted comfort in any sleep position
  • Lightweight Thermal Boost: Thermolite® Pro with FIR and hollow-core fibres adds up to 4 °C | 7 °F warmth
  • Easy to Clean: Quick-drying and machine washable with HeiQ Fresh odour control
  • Compatible Design: Fits all sleeping bags and snaps into Sea to Summit bags for secure positioning
  • Protects Your Sleeping Bag: Reduces washing frequency to maintain insulation loft and extend bag lifespan
  • Ideal for backpacking, travel, hut stays, and warmer-weather adventures

Sizing & Weight

  • Short (fits up to 170 cm): 235 g
  • Regular (fits up to 185 cm): 255 g
  • Long (fits up to 198 cm): 260 g
Contact us with any questions you have about this product

UK Postage

To provide the best possible service we use different courier services depending on the item Size, Weight and service selected. The Couriers we use are Royal Mail, Amazon Shipping, DPD & FedEx.
Most deliveries are made per working day [Monday to Friday] and exclude bank holidays, If you feel you will not be in to receive your parcel, please take advantage of using a different delivery address where someone can take delivery. All our couriers have pick up locations and can be selected once you have the tracking number and the courier has the parcel.

Deliveries are made between 8am till 9pm unless a specific option is chosen.

All Express delivery orders must be placed no later than 11am to be posted the same day [Monday to Friday]. Orders placed after this day may be posted the following working day

England, Wales & Southern Scotland
Order Value Up to £74.99
Low value & Large Letter Size - 2-5 Working Day*  - £2.50
Standard Parcel - 2-5 Working Day - £4.00
Express Delivery 1-2 Working Day - £8.00
Before 1PM - 1-2 Working Day - £10.00

Order Value Above £75.00

Standard Parcel - 2-5 Working Day - Free
Express Delivery 1-2 Working Day - £6.00
Before 1PM - 1-2 Working Day - £10.00

  • Certain oversized items, or items with an excessive length or diameter, carry a £20 surcharge. This is added during checkout and indicated in the product description.

North Scotland,Scottish Islands, Isle Of Wight

Order Value Up to £74.99 & Under 1.99kg
Low value & Large Letter Size - 2-5 Working Day*  - £2.50
Standard Parcel - 2-5 Working Day - £4.00
Express Delivery - 1-2 Working Day - £8.00

Order Value Above £75.00 & Under 1.99kg
Standard Parcel - 2-5 Working Day - Free
Express Delivery - 1-2 Working Day - £6.00

Order Value Below £74.99 & Weight 2-4.99kg*
Standard Parcel - 2-5 Working Day - £4.00

Order Value Above £75.00 & Weight 2-4.99kg*
Standard Parcel - 2-5 Working Day - Free


Weight 5kg to 15kg - 2-7 Working Day - Flat £20.00 Charge

*This delivery service is restricted depending on Size & Weight of the parcel. If your order is of an excessive size we may have to cancel the order

Channel Islands, Isle of Man, Northern Ireland,

Order Value Up to £74.99 & Under 4.99kg
Low value & Large Letter Size - 2-5 Working Day*  - £2.50
Standard Parcel - 2-5 Working Day - £4.00
Express Delivery - 1-2 Working Day - £8.00* - Under 1.99Kg only

Order Value Above £75.00 & Under 4.99kg
Standard Parcel - 2-5 Working Day - Free
Express Delivery - 1-2 Working Day - £6.00

Weight 2.00 to 2.75kg - 2-7 Working Day - Flat £10.00 Charge
Weight 2.76 to 15kg - 2-7 Working Day - Flat £25.00 Charge

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Can I return an item?

We can accept goods back for exchange or refund or Credit, The goods need to be of re-saleable quality and all labels and relevant paperwork are present. We will not accept any item back that has been worn, or not in a re-saleable condition i.e animal hair's, odors from smoke or fragrances, or any sign that goods have been used other than inspecting indoors.

As it’s the buyer’s responsibility to post goods back, we highly recommend using a courier with the correct insurance and proof of delivery back to us. We cannot be held liable for items lost in post.

Before sending your item back please make sure of the following

  • The item is still in a new and unused condition, free of odours and pet hairs
  • All labels and swing tags are still attached to the garment, and any boxed items are kept in the original box.
  • Any items which are blister packed are still in the condition in which they are sent.
  • Tents and canopies have not been erected and still in their original box.
  • If your order included a promotional item (such as a free gift or multi-buy offer), all items must be returned in full to qualify for a complete refund; otherwise, the value of any retained items will be deducted from your refund.

Full Returns Information can be found here

Outdoor Action Accept the following methods of Payment

  • All Major Credit Cards [excluding American Express]
  • Paypal
  • Paypal 0% Finance or Split Payment - More info

All payments are made via a super-secure webpage & following GDPR procedures