• Online:
  • URL for this product:
  • From the U.S. and CanadaCall 1-800-426-4840
  • Mon. through Sun., 4 a.m. through 11 p.m. PT.
  • InternationalCall 1-253-891-2500
  • Mon. through Sun., 4 a.m. through 11 p.m. PT. English language only.
Sea to Summit Insect Shield CoolMax Adaptor Liner - Mummy

    Sea to Summit Insect Shield CoolMax Adaptor Liner - Mummy

    This Sea to Summit Insect Shield CoolMax® Adapter bag liner is specifically designed for use in warm, humid and buggy conditions providing odorless insect protection and moisture management.

    • $57.95

    Item # 797112

    REI Members get back an estimated $ 5.80 on this item as part of their annual member refund.

    The REI Member Dividend

    The REI dividend is a unique benefit of membership in the REI co-op. It's comprised of your member refund—typically 10% back on eligible purchases—and/or your REI Visa® card rebates.

    Each March, active REI members and REI Visa cardholders who earned a rebate receive a refund in the form of an annual dividend notice.

    Only active members receive annual dividend notices. To maintain your active status as an REI member, you need to make net merchandise or shipping purchases of at least $10 per year, unless you joined that year. Member numbers are issued in one name and only that person receives the member refund. Your number can be used by others in your family, but it cannot be transferred to someone else.

    Questions? Call us at 1-800-426-4840 for more about your dividend or its redemption.

    Learn more

    Product size and color
    • 100% Satisfaction Guaranteed
    • Gear and Advice You Can Trust

    This item ships for free! Learn more

    To view videos or use the zoom feature on REI's websites, please download the latest version of Adobe Flash Player.

    • EPA-registered, odorless Insect Shield® Repellent Gear repels mosquitoes, ticks, flies, and fleas
    • CoolMax® polyester provides moisture-wicking, quick-drying comfort and offers the lightweight, softness of cotton
    • Invisible built-in Insect Shield® repellent remains effective through 6 months of exposure to weathering or through 25 launderings for washable items; do not dry clean
    • Use it as a part of your sleep system or by itself as a warm weather ultralight sleeping bag
    • Liner helps keep the inside of your bag clean, saving it from the wear and tear of washings
    • Drawcord hood with mini cordlock cinches around face to hold warmth in
    • Mummy shaped liner features a 3D footbox providing plenty of room for feet
    • The Sea to Summit Insect Shield CoolMax® Adapter comes with a lightweight Ultra-Sil™ stuff sack

    Insect shield products can't be shipped to Canada.


    Item 797112

    REI Membership

    Sea to Summit Insect Shield CoolMax Adaptor Liner - Mummy Specs
    Best use
    3 x 5 inches
    CoolMax polyester
    84 x (shoulder) 36 x (foot) 12 inches
    8.6 ounces
    0.24 kilograms
    Insect Shield
    Sleeping bag shape
    Added warmth (F)
    Added warmth (C)
    Stuff sack size
    Insect repellent
    Weight - metric
    Trademarked terms

    Sea to Summit Insect Shield CoolMax Adaptor Liner - Mummy

    Loading Ratings & Reviews...

    Rated 4.6667/5 based on 9 reviews
    Rated 5out of5
    by fromGreat for hot weather Warmth I've had this for a few weeks and have used it a couple times. The weather here is currently 70s and 80s during the day and 40s and 50s at night. This liner was excellent for napping in the afternoons/evenings when the temperature was still high, which is great, as I bought it so I wouldn't overheat during the summertime. It wasn't enough to keep me warm at night by itself however, which was good to know before not bringing a sleeping bag on a late spring/early summer trip. I didn't expect this to keep me warm in the cold, since it's made for hot temperatures, but wanted to see how versatile it is. I would say that it's probably adequate alone above 60 degrees. Insect Repellant The area in which I used this wasn't incredibly buggy, so I didn't get a great assessment of it's insect repelling performance. That being said, I didn't get bit or have any bugs around me when I woke up. Still, I can't make a call either way yet since I don't have enough experience with it. If I use it in a really buggy area I'll update this post. Size/Weight This thing packs down tiny and weighs practically nothing. It's an excellent little accessory to carry around all the time. Especially if it really does repel bugs well.
    Date published: 2014-06-23
    Rated 4out of5
    by fromWorked great for boys at scout camp Bought two for scout camp for the boys. They were eaten alive last year and slept in their sleeping bags to avoid the bugs even though it was in the upper 90's. I saw these in the local REI this year and - problem solved! Same camp, same heat, same swarm of hungry insects, but no problems - the boys LOVED these liners. No bites, and they swore that they were cooler in the bags than without. They seem delicate, but held up well. They pack down small. They were expensive, but well worth it, in my opinion.
    Date published: 2013-08-07
    Rated 4out of5
    by fromPrefect liner for the South This tiny little tube of cotton was just what I was looking for. Temps had been at 80F all day in Southern Florida, and the insects where out in decent numbers. I left the tent slightly open, knowing full well that this liner was meant to repell the little blood suckers. I drug my 5'11" 165lbs self into my North Face Aleutian 1S mummy bag as the temps started dropping into the low 60's. Overnight, it dropped to about 44F, I was in a 55F rated bag, and only faintly noticed having cold, sockless feet. Your results may vary. TLDR: Morning revealed that I did not have any welts from the various flying blood suckers. I was not overly hot or sweating during the night with the addition of the liner either. Not once during the night did I feel like i was wrapped up or constricted, this liner felt more like a sheet. I do recommend that you first get in the liner, then get in the sleeping bag of choice.
    Date published: 2014-02-21
    Rated 4out of5
    by fromKept me dry I originally bought this to test if I was allergic to my sleeping bag, but after 4 uses with this liner, I don't think I'll camp without it. I woke up every morning with dew on the outside of the tent itself (dew went past my rain fly) and sometimes my sleeping bag felt a little damp. This liner kept me dry every time hands down. Plus it's comfortable. I also thought it would get all wrapped up and twisted in my sleeping bag, but what happened was that it attached to me as I twisted around in my bag so it didn't bother me at all. Well done! I wish they made a pillow case in this same material!
    Date published: 2011-11-26
    Rated 5out of5
    by fromDon't travel without it! I took this to the jungles of southern India and paired with Sawyer's clothing treatment came home with only one bug bite in more than two weeks! My fellow travelers looked like they had chicken pox. This is especially great when mosquito nets are not a possibility.
    Date published: 2013-01-09
    Rated 5out of5
    by fromA lighter alternative An excellant alternative to a full sleeping bag on those hot nights. No complaints.
    Date published: 2013-08-21
    Rated 5out of5
    by fromA Life Lesson from a Sleep Sack... A friend of mine had this sleep sack my first year in Thailand, and I thought it was just a revolutionary idea. Here in Thailand, where it's too hot to even think about a sleeping bag, but where bugs are a part of every day life, what could be more perfect? It's my third year working in Thailand, and I purchased this sack before soon after my first. I guess my expectations for it were a little high - I'd envisioned myself stepping foot into the jungle and all manner of insects (and maybe even some smaller reptiles) retreating in fear. The jungle would be drained of insects, fleeing for their lives - unable to penetrate the forcefield provided from this sack rolled away in my pack. Perhaps this was a little hopeful, but I slept soundly in the wilderness and in my guesthouses and I figured that was enough, though I remained unsure of it's actual insect-repelling abilities. I am now sure. I left this beautiful, necessary, perfect little travel companion of mine at a guesthouse a few nights ago in the depths of the mountains to which I never plan on returning. No biggie, I thought. Ever the MacGyver, I bought some CoolMax fabric here in Chiang Mai and had it fashioned into a new sleep sack. Problem solved, no? And man, did I feel resourceful. Problem not solved. It's been three nights since I left my little green savior in the mountains. Back in Chiang Mai, in a reasonable guesthouse armed with screens, a fan, and copious amounts of mosquito repellent at night - and my body is RIDDLED with mosquito bites. I'm not naive enough to think that there was some sort of mosquito-bounty placed on my head while I was gone in the mountains. No, each itchy welt is a life lesson to me: You never really know what you love until you lose it. P.S. In case I wasn't clear, if I don't die of mosquito-related illnesses before my return home later this month, I will most certainly be reinvesting in this product.
    Date published: 2013-12-07
    Rated 5out of5
    by fromFit the bill I used this product on a recent trip to Haiti. It worked great. I used it on a overnight mountain trip an found it was breathable, moisture wicking and gave me peace of mind to know I had some extra bug resistance built into the fabric. Packs easily into a day pack. I also ended up sleeping in it in some questionnable beds at a hotel I stayed at. Highly recommended!
    Date published: 2010-10-27

    Ask a question and have it answered by REI product experts and fellow outdoor enthusiasts. Need immediate assistance? Use Live Help.

    Loading Questions & Answers...

    How are we doing? Give us feedback on this page.

        FREE SHIPPING With $50 minimum purchase

        Buy More, Save More! Thru July 18, save up to AN EXTRA 35% on REI-OUTLET gear & clothing!  Details & Exclusions
        • Join REI today!
        • REI Membership
        • REI member benefits include an annual refund (typically 10% on eligible purchases).
        • Join REI today!
        • Sign up for REI Gearmail®
        • and get 15% off selected items!
        • Store Locator
        • Locate an REI store near you.
        • Find a Store
        © 2014 Recreational Equipment, Inc. All rights reserved. REI, the REI Tree and Mountain design, Novara, and
        REI Adventures are trademarks of Recreational Equipment, Inc.

        Find REI on: FacebookTwitterYouTubeFlickrMobile site