Ultra-lightweight waist pouch for high-intensity trail running The Speed Liner 1 Belt lets you keep your essentials close when you're out running. This minimalist waist pouch sits firmly in place & does not slip, so you retain full mobility. It is extremely breathable & features Jack Wolfskin's newly developed, precision-adjustable hook & loop closure system. Clever ergonomics, too: the bottle holster is set at a diagonal angle & positioned to one side. For added security, there is a rubber loop to hold the neck of your water bottle. The elasticated pouch is sized to accommodate an MP3 player, energy bars, or GPS.