Big boi incoming, the adidas Prime X is going full-on Stay Puft marshmallow with a 50mm (!) stack height on the heel. But beware- you better have a good running form because Santa’s been watching to see if you’ve been doing all that cross-training and core work this year. If so, you could be in for a treat. If not, you may be eating some coal. Available now for $250 at the link below.