One of the factors driving lower prices is that the majority of the goods are inexpensive versions imported to the U.S. from China. Chain Store Age said both services are set to increase prices to help offset increased tariffs on Chinese goods that have climbed to 125%.

Both fast fashion giants announced on April 16 that U.S. consumers will feel the impact of changes to trade policy sooner than they thought.

The two businesses have been famously known as online shopping sites with very low prices, giving U.S. retailers stiff competition.