If you recall, I said that I found the cloth covered ones to be slippery compared to straight minicell? That kit is exactly one that I got and had that problem with. Plus the strappy pat tends to let it move around.
As below, you also have to take a look at the shape of the seat hanger/side to which the foam needs to be glued. If it is what is described below, you are going to be best off just getting a block of minicell then cutting and shaping it. Then glue it in.
URCHIN Portable Anchor
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