You might search for a 'pad extender' which is a similar device. It's basically just a sleeve for your pad, though in the extender case it adds 2 small 'flaps' up top to give you some wider shoulder protection.
I solved my pad moving around problem by replacing my blue ccf pad with one of those thin rubbery yoga mats. It has enough 'biite' to pretty much stay where I put it in my hammock, but the insulation value seems roughly the same. I will preface that by adding I tend not to move around much after I find my happy spot at night so maybe I don't stress it much and I am a fairly warm sleeper.
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