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I'm interested in your custom zipper-up tracksuit sets and would like to know more about the materials used in their production. It's important for me to understand if the fabric is comfortable and durable, as well as how it performs in different conditions. Additionally, I'd like to inquire specifically about the quality of the zippers employed in these tracksuits. Are they robust and reliable for regular wear? Any details you can provide regarding these aspects would be greatly appreciated! Thank you!