LS vs ZR2 What's the difference.

Excuse the ignorance but what's so special about the ZR2? How does it differ from other Blazers?
In New Zealand we only get the LS & LT and only 4x4 & 4door versions. Model years 1999 to 2002. New Zealand only allow used car imports up to 8 years old. i.e. 1999 is currently the oldest model allowed in. Used Blazers have only just started arriving late last year.
 

This has been answered here.  

Very interesting thanks for that.