I read that comment from the manufacturer’s rep and certainly did not think it was “China-bashing”. But let’s face it, there has been a reputation established of some of the products imported from China being very low quality, hence the lower prices.
As for the part about not covering it to allow it to breathe? Again, I absolutely agree with the rep on this one. Wrap an “air space” in something that doesn’t allow new air to circulate in and old air to circulate out, and YES, it WILL get warm under one’s 98.8F body temperature! Same concept as insulating your house, or good glass windows (double pane to trap air). Sheets are woven fibers that certainly ‘breathe’ (allow the free transfer of air through it). BREATHE is often a term used to describe free air flow, not literally inhaling and exhaling through ones lungs (“DUH”). Many covers are VERY tightly woven (some even plastic-lined) and do NOT allow good air circulation.