The following information is from Sparco's website,
The Evo competition seat has the quality and performance you’ve come to expect from Sparco and the Evo seat line. The Evo was designed and developed with extensive input from some of the most prestigious DTM and ITC championship drivers. Evolved from the Rev seat, the Evo features removable cushions to customize the back rest, height of the leg rest and cushion padding. The Evo is FIA approved.
The Evo has been upgraded with a new lower seat cushion for 2017.
The Evo Series is our most versatile competition seat and is available in four sizes to ensure proper fitment.
EVO - Medium
EVO II - Medium/Tall
EVO II US - Large
EVO III - XLarge"