Breathable waterproofing
'My jacket is three years old, it’s never been washed and '
Hello Matt (or perhaps we could call you 'Which' magazine),
Now, I don't know what make you jacket is, but to keep breathable waterproof (ie goretex) items in such condition, washing them is 100% NECESSARY and part of the care process.
You may well have found that just washing your jacket would have made it waterproof ........
I believe it's because the pores get blocked and then wick the water through the material. This would explain why this is happening in the tummy area, where the wicking can continue through to your other clothing.
If your jacket is not such a waterproof, then it sounds like the snake oil is worth buying.
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