Super tuscans were created in the 70"s and formalized in 1992 - Essentially they are wines from Tuscany that may include non-indigenous grapes from france and are identified with the Toscana IGT rather than a DOC. The reasons these wines came to the fore front was due an emerging wine market that didnt want to drink 100% Sangiovese blends and wanted to make their wines more approachable by adding any of the following merlot,cab sav, cab franc. 

Some of the best examples are Tignanello, Sassicaia, Rondinaia,Solaia and Ornellaia ( the suffix aia - refers to an open piece of land in Italian and has been used by producers to indicate a super tuscan). Typically they are aged in Barriques adding flavours of vanilla and spice

The need to make wines more approachable to the general market is at the forefront of all Solovino wine selections and reflected by Uggiano Chianti Coli Fiorentini, which contains 90% Sangiovese and 10% Cabernet Sauvignon, aged in oak barrels for 6months - easy drinking, affordable and smooth ! Not considered a Super Tuscan, but made in the same vein and why not, great day time drinking wine with traditional Italian Antipasti

Footnote - Chianti Classicos DOC (All have a black cockerel emblem on the neck of the bottle) are generally  80% Sangiovese and 20% non-indigenous grapes. They are moving towards a100% Sangiovese wine and away from Barriques in favour of the traditional Slavonian Oak vats known as botte. Classico can vary from commune to commune with different styles from compact grippy tannic wines of Gaiole to fuller and richer styes in lower lying Castellina. Altitude and soil type creating unique styles