Sure to be the best in hydration on the market, this handheld is ergonomically shaped to fit any runner’s hand and so easy to squeeze. It’s rigid where it needs to be and compresses easily for quick hydration. It also has a flat bottom to provide a solid surface for filling. This incredible flask is designed to be grip-free and lightweight and features double-wall construction to keep fluids cooler, longer. Lightweight flask is designed to fit right in your hand while being easy to squeeze. The fully adjustable hand strap paired with a no-slip, no-sweat insert allows for stress and grip-free running. Double-wall construction keeps fluids cooler 20% longer than other insulated bottles. Updated high flow Push-Pull Blast Valve™ cap has a quicker rebound to keep you hydrated on the go. Ergonomic design features 360 degrees of reflectivity and stash pockets for carrying keys or cards.