HyperWhistle, built to support the more adventurous side of you. We compliment gear and bags all around the world. We Engineered a premium Anti-Microbial HyperWhistle. So, that when you need a whistle, YOU HAVE A WHISTLE. Louder than any other alternative, and even the glossy finish compliments the finer side of your persona. We did our part to ensure that our gear is just as dependable as the straps on your boots. That's the HyperWhistle way.