Heat Reactive Jacket by Stone Island, a tracksuit top which changes colour from black to green once it has reached 27 degrees. The jacket uses crystal heat-sensitive fibres which react when heat is applied.
I like Blue Lizard products for kids and babies as its non-irritating and has a great bottle that changes color in the sun...let's kids know when to reapply. The sensitive and baby formulas are also chemical-free and fragrance-free.
“I think he was a little like the lizard that changes color with its surroundings. He appeared far more a gentleman in a gentleman's house. In that inn, I saw him for what he was. And I knew his color there was far more natural than the other.” ― John Fowles