ASICS Fujitrail trail running vest The ASICS Fujitrail vest is designed to carry hydration, nutrition, and essential gear during trail training and races, with a pocket layout that makes contents easy to access and an adjustment system designed to keep it stable while running. Material: 87% recycled polyester and 13% elastane. Hydration: two 500 ml flasks included. Pockets: elastic front pockets for the flasks, two open front pockets, two zippered pockets, two shoulder-strap pockets, and two rear compartments. Adjustment system: front closure with plastic hooks and an adjustable elastic cord, plus elastic cords at the lower hem. Ventilation: fully mesh interior. Additional details: integrated whistle, key hook, rear loops to secure a pole quiver, and reflective elements.