Mount Wingsuit

Mount Wingsuit is a mountain diving game in virtual reality that can be played anywhere. Dive down from thousands of feet above the earth in a realistic virtual environment without the fear of crashing down if something eventually goes wrong.

Welcome to Mount Wingsuit, where the thrill of hurtling down a mountain side in immersive VR with fast-paced arcade style gameplay will keep you in the zone for hours at a time.
Source

Video review