The full manufacturer's warranty from Tifosi is only valid when the Tifosi T-G570 Ventoux Sunglasses is purchased from an Internet Authorized Dealer. We will match any Internet Authorized Dealer's best price on the Tifosi T-G570 Ventoux Sunglasses. The Tifosi T-G570 Ventoux Sunglasses may be referred to by the following terms: T-G550, T-G570.