This hoverboard doesn't have any unlockable upgrades.
The Windglider is a type of hoverboard that protects from crashing for 30 seconds. When crashed, the hoverboard will explode and need to recharge for a few seconds before using again. It's the most expensive hoverboard in the game. It was introduced in the Tokyo 2014 edition. It has the appearance of a plane-like hoverboard.
The special power of "Smooth Drift" (formerly known as Air Drift) gives the ability that after you jump wings stick out and you will glide down for a few seconds, and when the super sneakers are activated, it will glide higher, allowing you to glide over trains and other obstacles.