The seller made two mistakes on my package but replied immediately to offer me a refund including postage or replacements. I was very happy with how this was handled and communication was very good. Regarding the masks themselves- the fabric and adjustable straps are wonderful. An improvement that I would like to see in other models is something elastic to seal the bottom of your chin.
Great communication with the seller and accurate product descriptions. In the future the addition of something to adjust the strap of these masks with over time would be a good upgrade to the model. The fabric itself is really soft and comfortable.