A vehicle includes a vehicle body defining a front wheel well. The vehicle includes an inflatable device that is a thermoplastic elastomer. The inflatable device is inflatable from an undeployed position to a deployed position. The vehicle body defines a cavity and the inflatable device has a forward chamber and a rearward chamber disposed in the cavity in the undeployed position. The forward chamber expands vehicle-forward from the vehicle body into the wheel well from the undeployed position to the deployed position. The rearward chamber expands vehicle-rearward along the cavity from the undeployed position to the deployed position.