Level 1 is totally see-through that needs an inner to cover the neck
Level 2 is see-through that might need an inner to cover the neck depending on the color
Level 3 is semi see through that needs double layer to cover the neck
Level 4 is almost opaque and does not need double layer to cover the neck
Level 5 is totally opaque
DISCLAIMER:?Bear in mind that all the photos are captured in a photography studio with bright lights from all angle. The colors are made to the most similar possible and might vary from each computer settings.