Why do the feathers of birds not become wet? Why does this type of water repellency in nature work without perfluorinated compounds? Incredibly talented chemists ask these important questions to find new natural solutions for our sport performance needs. In the past, all water repellent finishes contained harmful PFC's, but that is no longer the case. BIONIC-FINISH® ECO utilizes a unique polymer structure to achieve a very high level of repellency of water and aqueous substances. Our ECO Sporty® fabric is then bonded with a waterproof membrane to make the fabric completely waterproof.