Nikwax Basewash is a specialized cleaner for performance synthetic base-layer, it can save your base-layers! Safely cleans and deodorizes synthetic base-layer garments. Enhances the performance synthetic next-to-skin fabrics. Deodorizes and refreshes. Recommended for cleaning synthetic base layer, socks and next to skin garments. 100% Water based and Biodegradeable. Contains NO flourocarbons/VOCs. Nikwax..Easier, Safer, Drier.