Steam warm eye mask provides comforting warmth for over-used eyes from full day's work. It is the 

start of a new custom whereby modern people can warm their over-used eyes in order to feel relaxed 

and ease such stress.

How to  Sleeping Eye Mask keep warm?

Heating materials can reaction with oxygen in the air, convert chemical energy to heat energy, release heat.

How to keep warm so long?

Use the vermiculite which is mineral can keep warm.

What is the rope of medical non-woven fabric?

Because the product can not contact with air before use, so the material of the bag is very special, consists of raw material layer , non-woven fabric layer. Non-woven bags are made of microporous breathable membrane. It also must have an airtight outer bag-gelatin layer