Snowboarder is one of the three skins released under the Yeti's Mountain part of the Winter offer. It could be purchased using game coins on an individual basis in mid November 2017.
Snowboarder could be purchased in the Skins Shop under the ‘Winter’ tab for 490 coins. It was available for a limited time and may not be available for purchase in the future.
Details of this offer can vary depending on location, platform or time.
Note: The Yeti's Mountain sub-offer with the Snowboarder skin was released again for a limited time in late November to early December 2018. The price for Snowboarder remained the same at 490 coins.
Gallery
Snowboarder - Original Image