AfterShokz | Xtrainerz Zip Whether you're heading to the

Whether you're heading to the gym

Luxe Collection: Vibrant colors and a subtle shine add a fun

Durable rubber outsole

and 4th) metatarsal heads

designed to relieve discomfort caused by Runner’s Knee

AfterShokz | Xtrainerz Zip Whether you're heading to theTake open ear listening to new depths with Xtrainerz wireless MP3 headphones. Xtrainerz are an innovative solution for consuming audio in and out of the water while youre cross training toward your new PR. The open ear design removes the limitations of traditional swimming headphones, and the 4GB memory stores up to 1,200 songs, allowing you to take Xtrainerz on any adventure; no wires, no devices, no limits. (Not Bluetooth compatible).