I would argue that my second-most-important item is this pair of JBuds Air Sport True Wireless Earbuds ($69). I have spent the last few months curating my running playlist of pump-up jams and need to listen to it during the race to keep me motivated. The sound quality is good without being noise-canceling; I still like to hear background noise (in this case, the cheering crowd!), especially when I'm outside.