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How do Therm-a-Rest self-inflating mattresses self-inflate?

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How do Therm-a-Rest self-inflating mattresses self-inflate?

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When you open the valve, the open-celled foam responds by soaking up air, similar to a sponge absorbing liquid. Once the mattress has inflated, you can adjust the firmness by adding a few breaths or letting air out. It’s that simple.

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