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It's two layers of greenhouse plastic that is inflated with air.
14#Anniehui & Q9 C E: d" Q5 E* T! r# {! y: r 7 [* o/ \7 E1 r0 E1 c) k- vIs it a specific kind designed to hold air like a balloon? where it is available ?
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My husband seals the plastic layers himself, then use a small fan to blow air between the two layers. The plastic can only be bought at Horticulture supply stores.