Nikwax Cotton Proof™ is a safe, easy-to-use, wash-in treatment that delivers high-performance waterproofing for cotton, polycotton and canvas fabrics. It adds Durable Water Repellency (DWR) to help reduce water absorption and weight gain, while preserving the breathability of your gear in wet conditions. By applying a flexible, water-repellent coating to individual fibers, it allows moisture vapor to escape, maintaining airflow and comfort. This treatment enhances the longevity and wet-weather performance of your clothing and equipment. Designed for convenience, Nikwax Cotton Proof™ can be quickly applied in a standard washing machine, ensuring thorough coverage throughout the fabric. Cotton Proof Waterproofing Treatment Features High-performance wash-in waterproofing for cotton clothing and gear Adds Durable Water Repellency (DWR) to down, which protects against rain and condensation Prolongs the effective life of your gear Maintains breathability of your gear and optimises performance in cold and damp conditions Quick wash-in application can be done in home washing machine TECH SPECS Uses per bottle: Approximately 50ml per item of clothing, 50ml per m² for tents and other equipment For best results clean items first Follow instructions on garment's care label