Explanation
Used to express 'both A and B'; 'whether it's A or B'; 'not to mention A and also B'.
Formation
Noun1 + といい + Noun2 + といい + Comment
Detailed explanation
This grammar structure is used to provide two examples or two situations to demonstrate a certain characteristic or situation. It's a way of mentioning two items of the same theme to generalize or emphasize something applicable to them both. In English, it can be understood as 'both A and B', 'whether it's A or B', or 'not to mention A and also B'.
Examples
Nihon no tabemono to ii kankouchi to ii, subete ga subarashii desu.
Both Japanese food and tourist spots are all wonderful.
Kare no yasashisa to ii, tairyoku to ii, kare wa risouteki na paatonaa da.
Whether it's his kindness or stamina, he is an ideal partner.
Kono machi no eigakan to ii, kouen to ii, rounyakunan'nyo ga tanoshimeru.
Not to mention the movie theaters and parks in this town, they are enjoyable for all ages.
Kare no kashou ryoku to ii, dansu no sukiru to ii, kanpeki da.
Both his singing ability and his dance skills are perfect.
Practice
Grammar content sourced from hanabira.org.