Sea to Summit Reactor Sleeping Bag Liner – Fleece Standard (85 x 31.5) | Warmth, Hygiene & Odor Control

Cozy warmth on the go

The Sea to Summit Reactor Sleeping Bag Liner in fleece adds a soft, insulating layer to your existing sleep system. It combines hollow-core Thermolite EcoMade fibers with a grid-pattern fleece to help retain heat while remaining lightweight and breathable. This means you can enjoy a bit more warmth without piling on bulk, whether you’re camping under a chilly night sky or hostel-hopping across cooler destinations.

Smart design for real-life comfort

Designed as a mummy-shaped liner, it includes shoulder zippers and a footbox drawcord. These features let you tailor warmth and ventilation without compromising mobility. The liner is made to integrate smoothly with Sea to Summit sleeping bags, including compatibility with the Free-Flow Zip system in select models.

• Grid-pattern fleece paired with hollow-core Thermolite EcoMade fibers delivers warmth retention and a soft touch.
• Shoulder zippers and a footbox drawcord provide adjustable temperature zones for added comfort.
• HeiQ Fresh odor control technology helps keep the liner feeling fresh between uses.
• Optimized for compatibility with Sea to Summit sleeping bags and their Free-Flow Zip system.
• Sea to Summit Guarantee offers product assurance for the lifetime of the item.
• Lightweight and compact, it’s a practical upgrade for travelers seeking added warmth without extra bulk.

Why it matters on the trail or at camp

In real-world reading of temperatures, a sleep system can feel more personal than the thermometer suggests. The Reactor liner provides an extra layer of warmth that can make a chilly night more manageable, while its odor-control technology helps maintain freshness after extended use. The result is a comfortable upgrade to your existing bag setup, making late-season trips or sudden cool nights more approachable.

Beyond warmth, you gain a hygiene-focused solution that can simplify indoor or shared sleeping arrangements. The liner’s thoughtful fit—mummy shape and precise footbox control—helps you regulate heat without sacrificing freedom of movement as you move between layers or adjust your position during sleep.

For travelers who value practical gear with a long-term outlook, Sea to Summit’s lifetime guarantee adds a layer of confidence to your investment, encouraging you to plan trips with fewer compromises and more comfort on the road.

Two quick takeaways

• Extra warmth and personal hygiene when paired with your sleeping bag.
• Odor control and thoughtful temperature regulation for longer trips or varied climates.