This easy to wear and easy to use inflatable PFD features Membrane Inflatable Technology™ inside to reduce product weight and create a lighter and more flexible fit. Features reflective tape and safety whistle on inflation cell. Automatic inflation will automatically self-right most wearers within seconds of water entry 500 Denier Cordura® outer shell Exclusive Membrane Inflatable Technology™ inflation cell T1 version includes reflective tape and safety whistle on inflation cell.