Cool water is just a sip away. An insulated version of our ultra-light UltraFlask 500 ml, the UltraFlask IT 500 ml features our new IsoBound technology. The double-wall construction and open cell foam technology create a barrier – slowing the heat transfer from the user to the hydration. Customize your cap with two options depending on your run or vest, directly mount your bite valve or use the straw cap (which can be cut to any length).
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