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In the Find Suppliers section to the left, you can find great suppliers from both Europe and Asia for sportswear/performance wear. Basically everything that is NOT described as Organic Cotton in the Product Category.
When you source materials it’s important to be specific. Many people wear very different things to the gym. Who is your customer exactly and what products do they like and want to wear to the gym? A body builder wears a cotton tank or tee and sweatpants while a girls who’s gonna do cardio will wear tights and a recycled poly top.
You can also have a look at performancedays.com and order fabric swatches directly from the suppliers. They have a good library on the site where you can see the products and composition. Most of their suppliers have sustainability a priority as well:)