First 2023 design addition to our Proof of Work Apparel (TM) line of products for Bitcoiners.Up your game, print your apparel with sweat activated ink. Graphics printed using sweat activated ink are completely invisible until activated with moisture. As the shirt becomes wet, the design begins to appear. The more the person sweats, the clearer these graphics become. Once the shirt begins to dry the images disappear, ready to start the cycle again. Are you ready to put in the work?Made in America.