Enduro 
Featuring a Power Glass solar charging lens that extends battery life and is packed with top performance features to prepare for even the longest ultraraces, Enduro GPS is built for extreme endurance athletes. Like you.
Garmin Enduro 

Garmin Enduro Steel with Grey Strap
Built for extreme endurance athletes, the Enduro GPS smartwatch features exceptionally long battery life with a solar charging lens and comprehensive training features and metrics.

Garmin Enduro Carbon Grey DLC Titanium with Black Strap
The Enduro Carbon Grey Titanium is a lightweight GPS smartwatch for extreme endurance athletes. It features exceptionally long battery life with comprehensive training features and metrics.