SKU: 4615641501

Sea To Summit Reactor Midweight Liner - Regular

Sale price$71.95 Regular price$79.95
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USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Jul 15 - Jul 20

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For Your Every Summer RSVP, with Code: SUMMER15

Description

Sea To Summit Reactor Midweight Liner - RegularThe Reactor Midweight enhances your sleep system with advanced Thermolite Pro fabric. Infrared absorbing ceramic pigments and hollow core fibers trap body heat, adding up to 6C 11F to a sleep system with minimal bulk. Stretch knit fabric and arm openings allow unrestricted sleep, making it a great fit for any shape sleeping bag. Quick drying and easy to clean, it features HeiQ Fresh odor control and helps extend your sleeping bags lifespan by reducing

The Reactor Midweight enhances your sleep system with advanced Thermolite® Pro fabric. Infrared-absorbing ceramic pigments and hollow-core fibers trap body heat, adding up to 6°C|11°F to a sleep system with minimal bulk. Stretch-knit fabric and arm openings allow unrestricted sleep, making it a great fit for any shape sleeping bag. Quick-drying and easy to clean, it features HeiQ Fresh odor control and helps extend your sleeping bag’s lifespan by reducing wash frequency

Best Use: Backpacking, Cycle touring, Paddle touring

Features

  • Boosts Sleep System Warmth – Thermolite® Pro uses Far Infrared technology and hollow-core fibers to trap and reflect body heat without extra bulk
  • Freedom to Move – Stretch-knit and shaped arm openings allow unrestricted movement, providing natural comfort throughout your sleep
  • Technical Shape and Hood – Ergonomic design with a fitted hood delivers optimal warmth and comfort without extra weight or bulk
  • Stay Fresh Longer – HeiQ Fresh odor control technology keeps the liner fresh after extended use
  • Sleep System Integration – Snap connectors at the shoulders easily pair with Sea to Summit sleeping bags for quick, hassle-free entry and exit
  • Easy to Keep Clean – Machine washable construction simplifies care and reduces wear on your sleeping bag over time
  • Lower Impact Materials – Crafted with certified recycled fibers and bluesign APPROVED materials to minimize environmental impact

Tech specs

Regular
Weight 12.3 oz
Dimensions 76.0 x 31.5 in
Packed Size 4.5 x 7.5 x 4.5 in
Fits Up To Height 6 ft

Material(s)
100% Post-Consumer Recycled Polyester; Stuff Sack: 100% Polyester

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 4615641501

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4.0 ★★★★★
Based on 74 reviews
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Barb
Dallas, US
★★★★★ 5
SOOOO COMFORTABLE
Size: Large, Color: 2 Black,2 Blue,light Coffee
LOVED THESE SO MUCH. FIRST, BOUGHT THEM IN A MEDIUM (I AM 5'3 AND 143 LBS -- WEIGHT GAIN OF 10 LBS DUE TO COVID 19), BUT THEY DID CURL UP. IT DIDN'T MATTER...I COULDN'T EVEN 'FEEL' ANYTHING DIFFERENT FROM THE MOMENT I PUT THEM ON -- THEY FLEX RIGHT WITH YOU -- SO SOFT. LOVED THEM SO MUCH, I BOUGHT THEM IN A LARGE. I WILL EITHER WEAR THEM TO BED...OR UNDER MY DRESSES. BOTH SIZES FEEL SO COMFORTABLE -- DOESN'T MATTER WHICH SIZE. IF THEY DON'T HAVE YOUR DESIRED SIZE, TRY THE NEXT SIZE -- YOU WON'T FEEL ANY PINCHING OR DISCOMFORT. AGAIN...SOOO SOFT.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 21, 2020
A
Verified Purchase
Amazon Customer
Grantham, US
★★★★★ 5
Great product
Size: Small, Color: Light Coffee,grass Green,blue,orange,black
Softest underwear I’ve ever worn
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 22, 2026
L
Verified Purchase
Lacey Woodfield
Birmingham, US
★★★★★ 5
Very soft and lightweight
Color: White, Size: X-Large
I bought this when I had shingles and needed something soft but thin as a barrier between my skin and a sweater or sweatshirt. This was perfect. It’s super soft, non irritating, and was lightweight.
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Reviewed in the United States on January 27, 2026
L
Verified Purchase
Lynne Giles
San Leandro, US
★★★★★ 5
They are soft and last a long time.
Color: Black, Size: Medium
True to their claims.
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Reviewed in the United States on April 2, 2026
R
Verified Purchase
rez wolfe
Louisville, US
★★★★★ 5
Great undershirt!
Color: White, Size: Medium
Love the fabric, it's a great undershirt for year round comfort at the office.
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Reviewed in the United States on March 11, 2026

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