Built to go the distance.. Trainer for iPhone and iPod touch starts with a wide, stretch armband that adjusts to fit arms up to 19 inches in circumference. A slide-ring adjusts the band to fit then holds it in place. Trainer has a lightweight windowed case to hold your device. The perforated case frame is backed with sweat-wicking neoprene, allowing airflow to keep things cool and comfortable. A transparent touch-through window lets you control your Multi-Touch display, so you can adjust volume, navigate playlists, etc. Keep your iPhone or iPod touch protected no matter what the trail or road throws at you, with Trainer.