Sebastian Vettel, a Red Bull Racing team driver and four-time Formula 1 world champion, shows the design of a helmet which he will wear during Formula 1 Russian Grand Prix free practice sessions, at a news conference in Sochi.

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Former Formula 1 driver David Coulthard during a news conference in Sochi.

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Former Formula 1 driver David Coulthard during a news conference in Sochi.

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Former Formula 1 driver David Coulthard, left, and Sebastian Vettel, a Red Bull Racing team driver and four-time Formula 1 world champion, during a news conference in Sochi.

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Sebastian Vettel, a Red Bull Racing team driver and four-time Formula 1 world champion, during a news conference in Sochi.

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Sebastian Vettel, a Red Bull Racing team driver and four-time Formula 1 world champion, at the track of the Formula 1 autodrome in Sochi.

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Sebastian Vettel, a Red Bull Racing team driver and four-time Formula 1 world champion, at the track of the Formula 1 autodrome in Sochi.

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Red Bull Racing team driver Sebastian Vettel before a demo in Sochi.

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Formula 1 former driver David Coulthard during a demo in Sochi.

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Red Bull Racing team driver Sebastian Vettel before a demo in Sochi.

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Former Formula 1 driver David Coulthard during a news conference in Sochi.

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Red Bull Racing team driver Sebastian Vettel before a demo in Sochi.

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Russian Grand Prix promoter Sergei Vorobyov after a news conference in Sochi.

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Russian Grand Prix promoter Sergei Vorobyov after a news conference in Sochi.

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Former Formula 1 driver David Coulthard during a news conference in Sochi.

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Former Formula 1 driver David Coulthard during a news conference in Sochi.

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Former Formula 1 driver David Coulthard in a car after a news conference in Sochi.

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Former Formula 1 driver David Coulthard after a news conference in Sochi.

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Former Formula 1 driver David Coulthard near a car after a news conference in Sochi.

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Reigning four-time Formula 1 world champion Sebastian Vettel during a news conference in Sochi.

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Reigning four-time Formula 1 world champion Sebastian Vettel during a news conference in Sochi.

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From left: former Formula 1 driver David Coulthard and reigning four-time Formula 1 world champion Sebastian Vettel during a news conference in Sochi.

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Former Formula 1 driver David Coulthard during a news conference in Sochi.

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Former Formula 1 driver David Coulthard during a news conference in Sochi.

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Former Formula 1 driver David Coulthard and reigning four-time Formula 1 world champion Sebastian Vettel, left, during a news conference in Sochi.

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From left: former Formula 1 driver David Coulthard and reigning four-time Formula 1 world champion Sebastian Vettel during a news conference in Sochi.

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Former Formula 1 driver David Coulthard in a car after a news conference in Sochi.

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Reigning four-time Formula 1 world champion Sebastian Vettel during a news conference in Sochi.

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Reigning four-time Formula 1 world champion Sebastian Vettel during a news conference in Sochi.

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