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Twin wall polycarbonate glazing is included free with this greenhouse. Twin wall polycarbonate glazing is stronger than the flimsy single skin polycarbonate sheeting supplied with other greenhouses. Twin wall polycarbonate is virtually unbreakable and easy to handle, so its safe for the whole family. It provides good insulation from frost and maintains a more even temperature for better plant growth. Twin wall polycarbonate also diffuses light to prevent scorching.