45 degrees seems either too hot or too cold, but since there are talks of angles here, the Hydro 45 degree belt is an ideal number for keeping a water bottle close by and accessible during a trail run. 45 degrees angled water bottle is easier to reach for. You'll be drawing water faster than a gunslinger. Wide straps and a balanced load keep it stable when you're moving quickly. Year round, you'll reach for the Hydro 45 whenever high output activity calls. Material: Ripstop, Mesh.