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 and does not slip, so you retain full mobility. It is extremely breathable and features Jack Wolfskin's newly developed, precision-adjustable hook and loop closure system. Clever ergonomics, too: the bottle holster is set at a diagonal angle and 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.