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The new Big Zip Evo retains all of the good things about the older Big Zip LP bladder and then adds a few improvements
Due to this reason, they are usually quieter and more reliable but might not be as efficient at low speeds
Its liner is fully removable and washable, supporting hygiene after rides of any length
Generally speaking, the more road-biased features you add to a helmet (padding, quietness, weather protection, etc.), the less direct airflow it will deliver
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