Google all around the web and cant find exact information, it only says the second model is more lightweight, but no precise grams or oz's.
1 Answer
The Lite-Show is not a more lightweight version of the Kayano 20, it's a glow-in-the-dark / more-reflective version of the Kayano 20.
(Source - I'm sitting next to a warehouse with both versions of the shoe and I compared them.)