Wikipedia - T20 Blast

The T20 Blast, currently named the Vitality Blast for sponsorship reasons is a professional Twenty20 cricket competition for English and Welsh first-class counties. The competition was established by the England and Wales Cricket Board (ECB) in 2003 as the first professional Twenty20 league in the world. It is the top-level Twenty20 competition in England and Wales.

The competition has been known by a variety of names due to commercial sponsorship. From 2003 to 2009 it was known as the Twenty20 Cup, from 2010 to 2013 it was known as the Friends Provident t20 and Friends Life t20 and from 2014 to 2017 as the Natwest t20 Blast. From 2018, the competition is sponsored by insurance company Vitality and is known as the Vitality Blast.