A poly dust cap is hard and not breathable. 

Dimensions include the dome and lip on either side of the cap.

INTERNATIONAL SHIPMENTS ARE USPS PRIORITY MAIL INTERNATIONAL SMALL FLAT RATE BOX or FIRST CLASS INTERNATIONAL.   Our shipping costs do not include your country's customs charges, taxes and other fees.  Please do NOT ask us to send as a gift or to lower the declared value on the customs forms.

USPS Priority Mail International includes tracking and insurance.
USPS First Class International has limited tracking, NO insurance and is slower.  Depending on your country's customs some orders may take over 30-45 days.