The Jason Markk PFAS-Free Repel creates a durable, breathable barrier that effectively repels liquids and stains. Repel's water-based formula is safe to use on all materials like suede, nubuck, leather, nylon, canvas and more. It is also safe to use on all absorbent hat materials including (but not limited to) cotton, wool, felt, corduroy, and polyester. Engineered with multi-patented technology, a fine mist combined with continuous spray functionality covers large areas quickly and evenly in all directions. With the smart, re-usable head and convenient refill features added in, Repel is much more environmentally friendly than hazardous aerosols.