Filter of good workmanship and elegant and professional packaging, in addition to arriving inside a rigid cardboard box it has an elegant rigid imitation leather case to be able to carry the filter with you even when you can't or don't want to carry all the equipment, being thin it fits easily in your bag.
What I find missing are instructions for use, because it is not a given that everyone knows how to use it, or at least from the instructions I generally discover extra functions that I was not aware of and that could be useful.
The filter is applied simply by screwing it onto the main lens, in the case of my Nikon D3300 I can also cover it with the original cap without problems, while I have read in other reviews that this is not the case for all cameras.

Polarized filters help to soften contrasts especially when shooting in full light, for example at the seaside on a sunny day, but also at sunset. The fact that it is waterproof allows me to use it without fear especially on these occasions.
The adjustments are made through the side ring, but I still have to get the hang of it, because I'm sure that with use I will be able to make it perform better and better.
When switching between one filter and another the color change is not evident, but on the photos the result is obviously noticeable.
With the CPL filter instead you will work on the greater saturation of the colors and the reduction of haze and noise, reduce reflections and make the images sharper.
Obviously it is not a super cheap product, but the quality is undisputed and it is a tool that can easily give a more professional look to the photos.