SDG Bel-Air V3 Traditional Saddle Steel Rails BlackSDG Bel Air V3 Traditional Saddle Steel Black. Bringing the comfort of the Bel Air V3 to a more economical price point. The Bel Air V3 Traditional uses the same proven shape of the original V3 but utilizes a traditional sealing method to bring the cost down. All models still use top end EVA foam to ensure comfort is maximized and weight is minimal. Lower Cost Proven Profile Utilizes the proven shape of the current Bel Air V3 but in a more price point