I bought 2 of these belts in July 2019. The insulation works well. I like the larger size. I also use them in my running vest (not a Nathan product). I haven't had any problems with them. I took off a star because they came with a retractable top, not a quick release buckle. I bought Nathan's quick release caps (caps) separately and although they screw on, they don't unscrew as easily as the caps that come with the bottles.
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