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Disappointing compared to previous Nalgene protection, which really insulates. The insulation of this version is thin, so the drink does not stay hot for very long. Sure, the drink doesn't freeze, but it would be harder to drink even a warm than a cold drink in winter. On a winter hike, I drink the first drinks from Nalgene, which is protected by the new version, and then from Nalgene, which is protected by the older version
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Really works! Tested at +25 degrees, in this case the drink was still very cool after 9 hours (the bottle was then about half empty). However, the bottle had first been kept with this cover for about 40 minutes in the cold. It was a good investment. In autumn/cooler weather, you can definitely throw in 6 more hours.
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