Which piece of running gear do you consider most essential?

Quality running shoes
% (10 votes)
Good socks
% (1 votes)
GPS watch or fitness tracker
% (0 votes)
Hydration pack or belt
% (0 votes)
Running apparel (shorts, shirts)
% (0 votes)
Headphones
% (1 votes)
Body Glide
% (0 votes)