I know what it is lol and that's what I said? In the image which is the details for the Custom X, it says it has heel hammock under Hi-back. Haven't seen a pic of it though. Have you?
Here's the link to the entire 2021 Gear Preview over at Evo:
Get a sneak peak of the best new snowboard gear for the next winter from top brands like Burton, Lib Tech, Arbor, CAPiTA, Nitro & More