Mirror Film, is the most reflective & provides the greatest heat rejection. It also gives excellent "One Way Vision" in daylight to stop those prying eyes.
Please note: because the film works by reflecting light then this means it may have the reverse effect at night times. The film is not recommended if you are trying to achive privacy between internal rooms

Allows 20% of visible light through
Reduces the sun's heat 65%
Reduces the sun's glare by 73%
Reduces damaging UV light by 99%