If you previously added an item, you need to update the cart to show the new price. I just increase the qty to 2 then back to 1.
Refreshing the page alone isn't enough.
The mb4 have the same cuts/proportions as the Bred 4s. The only thing missing on the Mb4s are the bumps to provide extra clearance for your pinkie hammer toe/corns 🤣 🤣