What are the differences between the F50 adiZero III and IV boots?

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This week we had the chance to compare the latest speed silo by adidas F50 adiZero IV in the Solar Blue/Solar Zest/Running White versus the adidas F50 adiZero III in the Infrared/Black/Silver colourway.
The new F50 adiZero IV weighs just 150 grams which is 15 grams lighter than its predecessor the F50 adiZero III weighing in at just 165 grams!
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