The hexifly is flat on the back. That produces a wobble on the descent which is where a lot of fish are taken on the ice. There are several other ice jigs with the flat back for the same reason.

Note that both it and the diamond to its right have cross-eyed hook rings. They are meant to hang off vertical at about a 45 degree angle down which really opens the hook gap to both upward chasers and those that come in from the side. There are quite a few ice jigs like that anymore. There are also some tiny shad darts with the hook bent down to that angle which gives the same effect. Most everything I fish through the ice either hangs like that or horizontal. They work just as well for dipping and other open water vertical jigging.