The front/back neckline is different, so it can be used on both sides.
A 'two-way stripe sleeveless' with a tight waffle weave.
The armholes are not deep, so it is comfortable to wear daily.
A product with a solid thickness and texture that you can keep for a long time.
A regular fit that is not burdensome.
An item that is easy to match with various bottoms and outerwear.