One question : what's inside the amas ? Is there any sort of material that could retain water ?
I'm asking the question because at the end of my last session, I noticed that one ama was heavier than the other, and my father did too (he had come to pick me up and helped me disassembling). I initially thought "no bid deal, some water will just have crept in" but to my surprise there wasn't. And now I find the two amas weight roughly the same but I wouldn't swear they have not taken some weight.
Am I dreaming ? Is there any foam in there ?