Cool Guy is one of the three skins released under the monthly Skin'O'Matic offer. It could be purchased individually using game coins in mid February 2018.
Cool Guy could be purchased in the Skins Shop under the ‘Skin-o-matic’ tab for 690 coins. This skin was available for a limited time and may not be available for purchase in the future.
Details of this skin may vary depending on location, platform or time.
Note: The Skin'O'Matic offer with the Cool Guy skin was released again for a limited time in early March 2019. The price for Cool Guy remained the same at 690 coins.