The Toyota Sai has been given a little update in its native Japanese domestic market. It now features UV400 glass on the front doors, which is claimed to be a world first. The glass is rated to cut UV light up to 400 nm wavelength, compared to the regular 380 nm rating.

Toyota says this improves interior comfort, and we suppose in a way it improve fuel economy as well since the occupants will be just that bit less likely to turn up the air conditioning.

Like the Prius, the Sai is a hybrid-only model powered by Toyota’s 2.4 litre Hybrid Synergy Drive system (now replaced by the 2.5 litre system in our Toyota Camry Hybrid). Its origins are found in the Lexus HS 250h, a model that has since been discontinued in Lexus markets except Japan.