I recently ran at the Yosemite NP, in a race called “Shadow of Giant”, which was my very first 50K ULTRA and trail run.
As you can imagine, it was a long race in a beautiful surroundings of Yosemite but what made my run more enjoyable was a EE Hawk (a wearable audio).
It took me over 5 hours but being able to hear all the sounds like birds, winds and whisper of trees as well as my favorite music made my run real fun.
EE hawk (no light) weigh less than 7 oz. and stays in your shoulder with no burden.