Nikwax BaseWash is a new product created specially for cleaning synthetic base-layers, whilst enhancing the fabrics wicking properties.BaseWash refreshes and removes odors. Speeds up wicking on closely woven fabric. Enhanced rapid drying time. Aids the synthetic garment in keeping you cool in warm weather, warm in cold weather and dry in wet and humid. Conditions to ensure you get maximum comfort. Increases breathability of the base-layer. Easy to use - can be used in a washing machine. Guaranteed performance for 4 years from manufacture. WaterBased - environmentally friendly, biodegradable, non flammable, non hazardous. Does not contain fluorocarbons.