Iker Casillas becomes the latest player to be spotted training in a blacked-out prototype boot during a busy month of player testing for adidas.

adidas are continuing to receive player feedback on their 2015 boot line-up as Iker Casillas laced up in a prototype football boot that we've already seen on the feet of Bayern Munich's Xabi Alonso. The Real Madrid stopper's unidentified boots appear to be one of the pieces in the 2015 adidas puzzle along with a next-generation adizero and mystery collared-boot seen on the feet of Thomas Müller.

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Casillas' boots are completely different to any adidas boot currently on the market so all indications point to a new silo from the brand in a quite dramatic shake up in design. The all-over ridged rubber texture on the forefoot of the boot suggests the silo will be centered around control. The rear of the boot is clearly a different material to the rubber texture found on the front and is accompanied by an all-new heel counter and sole-plate. 

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Stay tuned for more on Casillas' adidas Prototype boots but for the time being let us know what you think of them. Drop us a line in the comments below.

Additional reading:
Xabi Alonso Trains In adidas Prototype
Thomas Müller Trains In adidas Prototype
Luis Suarez In Next-Gen adizero