During the year i have suffered Tendonitis and sore ankles and eventually went and got some advice about using Superfeet insoles. I bought the green option and have used them ever since.
My foot problems gradually reduced but it wasn’t long after that my Merrell boots started leaking. I just put it down to wear and tear and carried on wearing them regardless of having wet feet. I used them on this years TGO Challenge and didn’t have a single foot problem. They suit my feet and i can put up with wet feet.
However, i had a bit of a niggle in my mind that the hard edges of the superfeet insoles may have contributed to the membrane wear and caused the leakage. I couldn’t prove this of course without taking the boots apart.
Last week it all became clear. On a 10k local walk i felt my right boot was a bit loose and checking when i got home i found that the inner fabric of the boot had worn away, clean through, exactly along the edge of where the heel side of the superfeet insole touched. There is no doubt about it that although the superfeet have helped me physically they have drastically shortened the life of the waterproof membrane and now the boots themselves.
I did take a photo but with the problem being deep in the boot and the fabric is black the photo doesn’t do it justice.