Advertised as 100% nylon. This is NOT 100% Nylon! The back mesh is 100% polyester, as you will know when the shirt is delivered. It is listed as 100% nylon on all websites (including Colombian) which is why I bought it. The Tamiami shirt that the local seller told me about, basically the same, tells you that the lining is polyester and that's why I didn't receive it and was a bit skeptical about this shirt. not the same as what it does. My son who this was for is allergic to polyester. I had to cover the polyester backing with nylon mesh for him to use as I couldn't find anything else without polyester.
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