The safety is not woks, in 2005 received all Ökotest fashy Wärmflaschen rated "unsatisfactory". From now a different composition of the ingredients can not be assumed. The bottle is expected to be made in China, the material cheap PVC / PVDC / chlorinated plastics, greatly increased levels of phthalates was detected. Thus, this product can not be used with a clear conscience, and certainly not in direct contact with the skin, regular use and especially not in children.
I would like the product itself not comment - it's just a hot water bottle, which certainly served its purpose. But what good is it for a little warmth to address glaring health risks.