These masks are my absolute favorite. I cannot blow out a candle while wearing them. They go behind the ears AND behind the head. These are the absolute best design.
I will only wear Jamriang's mask because of the care with which they have been made and they are lovely and soft on your face too. I wash them in a 'delicates' bag in the washing machine.
These are excellent quality masks. They wear comfortably and wash well, and the adjustable fit is enough for even my bearded partner to wear. The filter pocket is also great for loading with a surgical mask with the loops trimmed down.