Sunclip

A shade smarter

Screenshots

Hunter's comment

Sunclip is an anti-glare attachment for sunglasses to play volly ball as well as tennis. In these games this product protect the players from direct sun rays.

Sunclip will also work as day time sunlight
anti-glare blocking for cyclists and for
drivers.

Link

https://www.kickstarter.com/projects/sunclip-eyewear/sunclip-a-shade-smarter/description