It was time this week to reproof the trusty (much much loved) Mammut Alto Guide waterproof jacket. I always find that a good time to make sure all my waterproof gear is performing at peak is as we head into the winter hiking season. We definitely don’t want to be wet on long winter hiking days.
Reproofing used to make me incredibly nervous because we know that washing a waterproof with the wrong stuff can ruin them entirely.
But after several years of trial (and sometimes error) with reproofing, this is my absolute favourite way and the best way to reproof a jacket. So let’s do it?!
What You’ll Need
So for me, the go to is this:
There’s a Mountain Warehouse equivalent in these two products which I have also used (but personally I found the Nikwax the more effective).
How to Reproof a Waterproof Jacket Step by Step
Ok, so let’s go:- Prep the washing machine. Remove the detergent drawer and clean it out to make sure there’s no residue of detergents which can damage waterproof fabrics
- Make sure all your jacket pockets are empty!
- Close all of the zips on the jacket
- Put your jacket in the washing machine
- Pour the Tech Wash into the detergent drawer
- Wash according to the instructions on your waterproof jacket (in my case I prefer to do short washes)
- Once our of the washing machine (before any drying) lay it down flat somewhere
- Spray the TX Direct all over the jacket front (ensuring you don’t miss any spots)
- Leave for 2 minutes
- Wipe residue off
- Turn over and repeat with the back
- Dry according to the jacket’s care instructions (personally I prefer tumble drying if the care label permits)
Waterproof Jacket Before Reproofing

Clean the Washing Machine Drawer and Drum
You don’t want to end up with detergent residue on your waterproof. So clean the detergent drawer out and give the drum a clean too. My washing machine has a drum clean cycle so I just used this.Prep the Jacket
Wipe off any loose dirt, zip up all the taped zips (front, pockets and others).Pop it in the Machine and Add The Techwash to the Drawer

After the Wash, Spray While Wet
Once you take your jacket out of the washing machine, you need to spray it with the TX Direct while it is still wet.So, lay out out flat immediately and spray it all ensuring you don’t miss parts.

Drying
If the case instructions for your jacket allow it, you can tumble dry gently. Otherwise simply air dry your waterproof.And that’s it! You’re done!Reproofing Result
Back to top performance for my Mammut waterproof!