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All metal hardware used on swimwear and denim are made from zinc alloy and are produced in line with Oeko-Tex® 100 Standard which ensures that no harmful substances are present.

Zulu & Zephyr branded buttons are also produced in line with Oeko-Tex® 100 Standard.

As of 2022, we have rolled out the use of corozo buttons which are a biodegradable material made from the nut of a tropical palm. Unfortunately when choosing a sustainable alternative the options are limited, therefore due to the natural colour of corozo buttons we are unable to use these on light coloured garments. Naturally, corozo buttons will be featured in their natural colour or responsibly dyed to match the outer garment.

Look for the following eco key for all Oeko-Tex® 100 Standard certified styles: