Nikwax TX.Direct has been specifically designed and optimized for breathable waterproof clothing, providing Durable Water Repellency (DWR) while maintaining breathability. Nikwax TX.Direct requires no heat to develop its DWR, so it is not necessary to use a tumble drier for best results. The washing machine application ensures that the treatment goes right through the garment, treating seams, tapes and cords, as well as the fabric. Also, as the need for tumble drying is removed, this saves energy and protects more vulnerable, older, garments from heat. Nikwax TX.Direct Wash-In has been specifically designed and optimized for breathable waterproof garments; it leaves a flexible water repellent treatment on individual fibers allowing moisture vapour to pass through, maintaining breathability.