Description A lightweight, high performance, elasticated waist pack carrier with 3M Scotchlite reflective piping for increased visibility. Holds running water bottle & extra nutrition flask for energy gel. When to use it To provide a non-restricting source of hydration & carbohydrate replacement during running & cycling. ideal to be used where there is road traffic. Sizing Fits 26" to 42" waists. How it Works Nathan have been developing products for runners for over twenty years. The Nathan X-Trainer Plus is more than just a water bottle carrier. They have produced the perfect high performance running bottle, nutrition flask & carrier, with design features that will improve your running performance & safety. Nathan X-Trainer Plus features a lightweight waist pack with an exclusive XTS Cradle, which wraps snugly to the contours of the body & holds the bottle & nutrition flask securely. The limited stretch belt is comfortable, secure & breathable due to the moisture wicking mesh design. The X-Trainer Plus has 3M Scotchlite reflective piping for increased visibility & the waist pack also has two expandable zipped pockets for carrying small essentials. The Shock Cord one pull tension lock can be used to secure a jacket in place. The 22oz (0.62 litre) polyethylene bottle & nutrition flask are designed to be squeezed so you can control the flow of liquid, & a textured surface to reduce the likelihood of dropping the bottle or nutrition flask. The bottle also features the patent pending Quick Clip finger loop for easy grabbing & attachment to backpacks & belts. The bottle can also fit into a standard cycling bottle holder. The nutrition flask has a capacity of 5oz (160ml) which is ideal for a 100g portion of an energy gel that can provide essential carbohydrate replacement during intense physical exercise.