Frequently Asked Questions

1. How can I get the right size and shape for your nostrils fit? 
- Shoot a picture of your nostrils to see if you have round or slotted/narrow nostrils. Size is very important to ensure the nasal filter/dilator's efficacy and durability. First-time buyers are recommended to order the Multi-Size-Pack. For the nasal filters, if you hace round nostrils, Multi-Size-Pack(S/M/L/XL) Round is recommended to you. If you have slotted/narrow nostrils, Multi-Size-Pack(S/M/L/XL) Slotted is recommended to you. For nasal dilators, first-time buyers are recommended to order the Multi-Size-Pack(S/M/L/XL).
Everyone's nose is shaped differently, and choosing Multi-Size-Pack is more efficient than measuring the nose size by yourselves. 

2. How can I choose the right nasal filters?
- WoodyKnows has 6 kinds of nasal filters, Ultra Breathable (UB), Super Defense (SD), Gas&Pollutant Reducing(GP), Super Breathable (SB), Super Defense Max(SDM) and 3 in 1(Combines UB&SD&GP). The breathablility of them is as followed, UB>>SB>>SD>>GP>>SDM, while the filtration efficacy is on the contrary, UB<
3. How can I clean the nasal filters/dilators? 
- We don't recommend you to wash the replacement filters because this will affect its filtration effect. The replacement filters need changing every 1-3 days. The filter frame/nasal dilator should be washed every day for hygiene with soap or 70% alchol for maximum protection and avoid avoid direct sunlight. With proper care, the frame/dilator could be used for more than 1 month.

4. How long will my order be processed? 
- Your order will be processed in 1-2 business days after the payment. There will be a delay if the carriers stop service during Chinese Festivals.

5. Payment method. 
- Currently we only accept paypal. Thanks.