A group of US lawmakers is calling on US officials to eliminate footwear duties from nations involved in the Tran-Pacific Partnership (TPP) trade talks - including Vietnam.

Currently, US tariffs on certain footwear from nations like Vietnam can reach upwards of 67.5%, according to the Footwear Distributors and Retailers of America (FDRA).

Fifteen US Senators and over 45 members of Congress have sent letters to US trade representative Michael Froman outlining their concerns.

The TPP free trade agreement is being discussed between the US, Australia, Brunei, Canada, Chile, Malaysia, Mexico, New Zealand, Peru, Singapore and Vietnam. Japan is also set to join the talks. The 18th round of negotiations is taking place in Malaysia.

The inclusion of Vietnam, the world's second largest footwear exporter to the US, is a major stumbling block.

The country - along with US footwear retailers and importers - want the US to remove duties on footwear as part of the agreement. But opponents claim Vietnam's footwear industry benefits from government intervention, currency manipulation, and low labour standards.

"US tariffs on footwear do not reflect the global supply chain of the footwear industry," said Senator Ron Wyden.

"While much of the high-paying jobs in design and innovation are found in the US, almost all of the manufacturing is done at different points around the world.

"Eliminating the high tariffs on footwear that is not manufactured in the US will help lower costs for consumers and help grow an American industry that is creating good-paying jobs here at home, including through domestic manufacturing."

In 2012, $297m in duties were paid on footwear imports into the United States from TPP countries, FDRA data shows.