Polar Grit X WhiteThe Grit X White is currently available at the shops below. It's current lowest price is $429.00. This is a variation of Grit X.
The Polar Grit X outdoor multisport watch is an uncompromising combination of rugged and durable, yet lightweight design, top training features and the possibilities of Polar Flow, the ultimate training platform. Polar Grit X comes with built-in GPS, compass and altimeter in training mode, and Polar’s unique Smart Coaching features that make sure you’re ready for your future adventures.
You can find more information on Polar's website
Or more specifically Grit X's page
The following websites have reviews of this product:
DC Rainmaker - Polar Grit X GPS Watch In-Depth Review
Triathlete - Reviewed: Polar Grit X Smartwatch