Wear AM charges US state sales tax in various states but not all. This is due to the Wayfair vs. South Dakota Supreme Court ruling.
For European orders, we also collect VAT (value added tax) only in countries in the European Union common trading area because we have a distribution office there.
For Australian orders we charge the GST (goods and services tax pre-shipment as mandated).
If your order is coming from outside of the EU or Australia, there is a chance your home country customs will levy an import tax but this depends on the specific country.