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Self-Inflating Foam Sleeping Pad ; leaks (Charles Village)
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At this point, I just want to give it away. It still has a foam structure internally, but loses air after 30 minutes. You may find success patching it - I didn't try.
It makes an solid secondary pad to increase R value on a cold night under a primary pad. This is because even without air, it's still has a foam internal structure.