Puro means "professional" in the Japanese language and every part of the filter shows the professional standards.
Kenko Puro Polarizer is a precision optical glass polarizer designed to maximize your image performance and control.
Make blue sky pop, reduce glare on water and glass surfaces, control shiny skin in portrait applications, and increase resolution in telephoto shots by eliminating natural atmospheric haze.
Kenko Nyumon filters are a Kenko Imaging USA exclusive product.
Find more details here: https://kenkoimagingusa.com/collections/cpl-filters/products/kenko-puro-c-pl-mc-circular-polarizer