13#ceramistpalace + L) ?4 K9 G5 Y+ X* F* j! x" w 0 C/ i; b$ q: R8 C 0 w% x, M2 w# f" z2 M5 Z! z: ?It's two layers of greenhouse plastic that is inflated with air.
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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.