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Amazing product! Totally saved me! I have hyperhydrois and a chambray blue work uniform that shows all perspiration clearly. This tshirt has blocked all sweat stains and keeps me feeling cool and fresh all day, even when busy or stressed. Its all over sweat blocking is great for me as I am prone to sweating down my back, not just underarms. It's thicker and more sport-like material than I expected, and it has a kind of strange rustley sound when you scrunch the fabric, but its very comfortable and not visible under my uniform. Great length to tuck into your pants or skirt too.