GRAMMAR DETAIL

といい〜といい

both ... and ...

Cites two representative aspects to show that the same evaluation applies to the subject as a whole.

Examples

色といい香りといい、この茶は秋によく合う。

Both its color and its aroma make this tea a perfect match for fall.

声といい話し方といい、彼は父によく似ている。

In both his voice and his way of speaking, he closely resembles his father.

デザインといい使いやすさといい、この製品は優れている。

This product is excellent in both design and ease of use.

Structure: Pair nouns naming two representative aspects with といい to give a shared assessment of the subject.
Basic usage: デザインといい使いやすさといい、この製品は優れている。 judges the product excellent by citing its design and ease of use.

Difference from a simple と list
- 色と香り simply joins two nouns. 色といい香りといい highlights each aspect separately as grounds for the following assessment.
いい does not determine a favorable judgment
- In this construction, いい is a form of 言う. The following statement determines the evaluation, allowing criticism such as 態度といい言葉遣いといい、失礼だ.