• 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.
Cocoon CoolMax Mummy Liner


    Cocoon CoolMax Mummy Liner

    Add comfort to your mummy bag with this breathable, moisture-wicking CoolMax® liner. See details

    • $44.95

    Item # 649745

    REI Members get back an estimated $ 4.50 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

    Add comfort to your mummy bag with this breathable, moisture-wicking CoolMax® liner.

    Product size and color

    Add comfort to your mummy bag with this breathable, moisture-wicking CoolMax® liner.

    • 100% Satisfaction Guaranteed
    • Gear and Advice You Can Trust

    Orders of $50 or more ship 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.


    Add comfort to your mummy bag with this breathable, moisture-wicking CoolMax® liner.

    • Keeps your bag clean, saving it from the wear and tear inflicted by washing machines
    • Adds approximately 8 degrees of warmth to your sleeping bag
    • Width tapers from 32" at the shoulder to 24" at the foot
    • Comes with stuff sack for convenient packing


    Item 649745

    Members: earn a
    $20 bonus card

    When you spend $100 April 14—29

    Single-use bonus card redeemable by
    REI members MAY 2—12, 2014.

    Not a member? Join Now!
    Add to Cart

    REI Membership

    Cocoon CoolMax Mummy Liner Specs
    Best use
    Up to 5 degrees
    Up to 2.8 degrees
    3.5 x 7 inches
    CoolMax polyester
    86 x 32(shoulder) x 24(at foot) inches
    9 ounces
    0.26 kilograms
    Sleeping bag shape
    Added warmth (F)
    Added warmth (C)
    Stuff sack size
    Weight - metric

    Cocoon CoolMax Mummy Liner

    Loading Ratings & Reviews...

    Cocoon CoolMax Mummy Liner is rated 4.3333 out of 5 by 6.
    Rated 4 out of 5 by from I love this thing Very nice liner. I bought this last minute as I had planned an early Spring camping trip and the temperature took a turn on me. I was afraid the 30 degree bag I had wouldn't be enough so I bought this. The liner made my mummy bag warmer and much more comfortable. Also it is easier to wash than trying to wash an entire mummy bag. I've used it twice now and can't believe I went this long without one. Packs up nice and tight for cramming in a backpack.
    Date published: 2014-03-26
    Rated 4 out of 5 by from Great Product Extremely comfortable. I can't use word to describe the amount of comfortable this is. The only issue I have with it is that I feel like I could tear it very easily. I think this just comes with the territory. If it was thicker it would be too warm and bulky.
    Date published: 2014-03-26
    Rated 3 out of 5 by from Glad I bought this Bought this in preparation for a cross country cycling trip next summer. I had a chance to break it in during RAGBRAI (Iowa) last month. On hot nights it was a perfect lightweight blanket - I did not even get in it. On cooler nights it was great by it self as a bag (though not always easy to get out of during the night.) I did not take my sleeping bag, so on cool nights I used the liner while wearing long sweat pants and wool long sleeved shirt. No problems down to 60 degrees.
    Date published: 2014-03-21
    Rated 5 out of 5 by from Does what it's supposed to We bought this liner for my down mummy bag, with the primary purpose of keeping the bag clean. As an added bonus, it also adds a couple of degrees to the bag's warmth. When the weather was too warm to be zipped in the down bag, the liner was the perfect lightweight blanket. It washed well after use, and seems to be good to go for the next trip. The material is a little thin, so I'm not sure how it will hold up over time, but so far, I'm very happy with it.
    Date published: 2014-03-21
    Rated 5 out of 5 by from Helpful extra warmth I bought this as a gift. I was not sure if it would be needed, but it was needed and was much appreciated!
    Date published: 2014-03-21
    Rated 5 out of 5 by from Keeps the bag clean, adds warmth Bought two of these before we went on a month long road trip with 2/3 of the nights sleeping in this liner and a sleeping bag. The liner is very soft and comfortable and helped keep the bags clean! It's much easier to just toss the liner in the wash than the bag itself, so we could launder them in the middle of the long trip if they became stinky.
    Date published: 2014-03-21

    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

    MEMBERS, EARN A $20 BONUS CARD! When you spend $100 April 14-29. Single-use bonus card redeemable May 2-12. Details
    • 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