I'm not sure if it is more reflective, but the heat sheet I tested seemed warmer than the mylar sheets I've used. It was also stronger and quieter. Plus it is a better signal, IMO- I'm always worried that a mylar sheet will be mistaken for water if used as a standing signal. Blaze orange on the other hand.
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-IronRaven
When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.