The North Edge Cross Fit2 combines a comparatively rugged design with a large display and a 320 mAh battery. The smartwatch also has a GPS module, is IP67 certified and supposedly features a heart rate monitor. The US$69.60 smartwatch is available to order from AliExpress.
https://www.notebookcheck.net/North-Edge-Cross-Fit2-A-budget-smartwatch-that-has-a-heart-rate-monitor-a-GPS-module-and-is-IP67-certified.529027.0.html