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Is it your greenhouse ? Look like it is a kind of transparent sheet attached to the wood frame, not glass or anything, right?
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It's two layers of greenhouse plastic that is inflated with air.
15#ceramistpalace 6 T6 g' B, D% e) R R : }8 E# r2 w1 o ; ?# q8 C8 c0 ^2 ]0 r r; D9 t) |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.