Who makes it: Jaybird
What it costs: $130
Why we like it: Anybody who uses Bluetooth earphones knows that many of them have a giant Achilles' heel: sweat. Just a few drops can short out the electronics in tiny in-ear buds. Endorsed as the official training headphones of the USA Triathlon organization, Jaybird's Freedom Spirit Bluetooth earbuds promise not to expire when you perspire. They include a lifetime warranty against sweat to back that up. Music sounds warm and clear, without the thumping bass of other headphones, and on-ear controls let you answer your smartphone without reaching into your pocket.