HYGIENFRESH® SFELTRIX is the revolutionary silk protein based product that can replenish, strengthen and protect wool, silk and delicate garments. Used together with standard detergents it prevents wool felting; it creates a protective layer on fibres to make them last longer. Used in every wash it maintains the original strength of fibres. Garments treated with Sfeltrix have an incomparable softness. SFELTRIX silk proteins also work on cotton!!!