This display of your device could break out of nowhere at any point in time, even despite very careful use, because it can fall from a few meters up.

In such cases you will certainly appreciate the JC Com Full-screen Curved Tempered Glass Soft Screen Protector for Apple Watch,

The outer surface of the cover will prevent any soiling by smudging.

Protective glass is three times stronger than any ordinary screen protectors

Will not interfere with touch sensitivity

JC Com Full-screen Curved Tempered Glass Soft Screen Protector for Apple Watch