Here is what they have to say.

It rejuvenates the water repellency of tired, worn clothing.
It replaces water repellent finishes.
It overcomes the problems of gear ‘wetting-out’. This is a real problem as they then get cold.
It maintains breathability.
It prolongs the life of gear and optimises performance in wet weather.
It’s easy to apply.
It has a 4 year shelf life.

A 300 ml bottle is enough to proof 2-3 garments depending on the condition of the fabric being treated.

To maintain the performance of waterproofed gear, regularly clean with Nikwax Tech Wash to remove everyday dirt and contaminants.

Choose from a spray bottle or wash in.  This is when you remove liners and armour then hand wash the gear in the laundry sink in a TX Direct solution. Best results are obtained by using Tech Wash first. No use trying to water proof road grime and bugs too!

Remember
Green for clean
Purple for proofing