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Our Field Trip™ spectrum enhanced silver reflector is applied to a gloss white - triple layered grow sheet. It completely blocks out all light and traps in all light. Use either silver or white side. It is the exact same material we use for our grow tents. It's reusable and the most rugged on the market. This extremely insulated , waterproof, thermal material is non toxic (will not off-gas or react with heat).
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