The Saucony ProGrid Kinvara is a lightweight, minimal neutral trainer that features a one piece midsole/outsole with carbon triangle lugs for added durability that look like very similar to the original Jazz. A three-piece upper provides a good amount of support, is breathable and sports a cool graphic treatment.
The ProGrid Kinvara is very light for being classified as a trainer. Based on this metric, the Kinvara is light at a projected 7.7 oz. If you are looking for a lightweight trainer that can double as a racing shoe.
Below is a video from the shoe designer.