recommendation needed for powerhead foam cover

[Spongebob20]

I have a BTA that has been walking around alot lately and I'm going on vacation soon. I want to get a foam guard for my Hydor Koralia powerheads. Just wondering if anyone had a recommendation or link to a foam guard? Could only find the ones for the Vortechs online

 

[MBC2012]

DIY - nylon hosiery and a rubber band in a pinch

 

[ocellaris123]

Depending on size of the koralias I found that the vortech foam guards fit over the koralias.

 

[Bowels]

can i use just a filter sock, and cut the end off and fit it over it? Will that make it way less powerful?