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Cordura is a collection of synthetic fiber-based fabric technologies used in a wide array of products including luggage, backpacks, trousers, military wear and performance apparel.
https://en.wikipedia.org/wiki/Cordura
EDIT: these are great gym shirts: https://au.puma.com/au/en/pd/favourite-blaster-mens-training…
Complete the look: https://www.ozbargain.com.au/node/804580