This hoverboard doesn't have any unlockable upgrades.
Coral is a limited hoverboard in Subway Surfers. It is a limited hoverboard exclusive to . Like any other hoverboard, it protects you from crashing for 30 seconds. When crashed, the hoverboard will explode and need to recharge for a few seconds before using again. Like most other limited hoverboards, it costs 50,000.
It is a blue hoverboard with coral growing on it, there's also some suckers growing all around the board.