Sea to Summit Reactor Midweight Liner
Sea to Summit Reactor Midweight Liner
Sea to Summit Reactor Midweight Liner
Sea to Summit Reactor Midweight Liner
Sea to Summit Reactor Midweight Liner
Sea to Summit Reactor Midweight Liner
Sea to Summit

Sea to Summit Reactor Midweight Liner

$74.95
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Reactor Midweight Sleeping Bag Liner
Reactor Midweight Sleeping Bag Liner
+6°C / 11°F Warmth Boost · Thermolite® Pro · Midweight · 3 Sizes

The Reactor Midweight is a stretch-knit sleeping bag liner that boosts warmth and versatility for three-season backpacking. Snap closures integrate it with compatible Sea to Summit sleeping bags, making it easy to add or remove mid-trip as conditions shift.

Midweight Warmth for Shoulder Seasons
Thermolite® Pro hollow-core fibers and infrared-absorbing pigments trap body heat, adding up to 6°C / 11°F to your sleep system with minimal bulk.
Stretch-Knit for Freedom of Movement
Articulated arm openings and stretch fabric let you shift naturally through the night without the liner bunching or restricting.
Fitted Hood Retains Warmth
The ergonomic hood seals in warmth around your head and neck — areas where heat escapes fastest.
Snap System Integration
Snap connectors at the shoulders pair with Sea to Summit sleeping bags for quick, easy entry and exit.
Stay Fresh Longer
HeiQ Fresh odor control keeps the liner fresh on multi-day trips without frequent washing.
Dimensions
Short
178 × 80 cm / 70 × 31 in — fits up to 170 cm / 66.9 in
Regular
193 × 80 cm / 76 × 31 in — fits up to 185 cm / 72.8 in
Long
198 × 80 cm / 78 × 31 in — fits up to 198 cm / 77.9 in
Performance
Temperature Boost
+6°C / 11°F
Best Use
Backpacking, Cycle touring, Paddle touring
Weight
Short
330 g / 11.6 oz
Regular
350 g / 12.3 oz
Long
365 g / 12.9 oz
Packed Size
All Sizes
19 × 11.5 × 11.5 cm / 7 × 5 × 5 in
Materials
Fabric
100% Post-Consumer Recycled Polyester (bluesign APPROVED)
Stuff Sack
100% Polyester
What's Included
In Box
Stuff sack

Machine wash cold — no fabric softener.

Air dry or tumble dry on low heat — no dryer sheets.

Avoid frequent washing to preserve loft and extend liner life.

Shipping Policy

Components:

All component items (wheels, drivetrains, suspension, brakes, etc.) ship within 2-5 business days of purchase.

Bicycles:

Complete bikes typically ship within 2–3 weeks due to build, tuning, and inspection times. You will receive tracking information as soon as your order is ready to ship.

Riding Gear & Apparel:

Riding gear and apparel orders (helmets, jerseys, gloves, etc.) ship within 2-5 business days.

Returns & Exchanges:

If you received the wrong size or wish to exchange an item, it must be returned in original condition—unused, uninstalled, and with all packaging intact.

For full details, please see our Refund Policy before initiating a return.

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Prepared with intention.

Every product is carefully inspected and handled by our team before it ships. From fit and function to final details, we make sure each piece is ready for the outdoors ahead—so you can focus on the experience, not the gear.

Passion drives us

At SpokeX Bike Co., bikes aren't just our business — they’re our way of life. As a rider-owned and operated shop, every decision we make comes from firsthand experience on the trail, at the race, and on the open road. We know what it’s like to chase a new line, push through the pain cave, and celebrate the ride — because we live it every day.

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