Idea of ​​slippers is class, the quality will be the loser

I gave the original Hot Sox supersoft heatable slippers for Christmas my sister. Always complaining of cold feet and when searching for a funny gift idea I found the heatable slippers that you can heat in the microwave like a Kirschkernkissen.
The slippers I liked at first sight, they had been very large and on closer Betrachung I realized that in the sole a fill is similar to embedded a herbal cushion.
My sister was very excited about the slippers and told me that they have put the slippers exactly as prescribed in the microwave. They were was pleasant and were wearing good!
You can not just put the seats run with them: Note.
But after a short time, the seams of the slippers and went to the inner workings trickled out.
Seemingly very quickly "cobbled together" material.
For the idea of ​​slippers I'd give 4 stars, the implementation in terms of quality is very poor!
Therefore, only two points