I have been over a year trying to get my C3 Pro fixed. It has been returned by Schuberth three times with no fault found. Even the dealer saw water running inside the helmet under a tap but would not hold them to account retreating behind their No fault found diagnosis. They have basically told me it must be my height, bike or the way I ride it. Bought a C4 from the same company, no mentioning any names because I may be taking this to court, and it both leaked immediately and the pinlock misted up. I had a wet weekend in Wales almost blindfolded most of the time. Took it straight back and again complete denial even though when I looked on the shelf another C4 pinlock wasnt even touching yet alone sealing against the visor. Turns out it isnt a pinlock visor but a copy used to save money and company admitted in their magazine that there were issues obviously trying to head off multiple complaints. I contacted Schuberth direct and both helmets went back to them via the dealer in September. Literally received the helmets back on Monday. The C3 Pro has finally had new hinge mechanisms fitted and appears to be watertight under a tap, the C4 has a visible gap between the pinlock and visor and immediately leaks through the hinge mechanism on to the bottom rubber as before, which I assume is then whipped across the inside of the visor. Believe it or not the C4 was returned with no fault found. The dealer now tells me that they are going to nothing more as Schuberth say it isnt faulty and refuse a refund. I bought a Shoei Neotec to use in July when I was without a helmet whilst mine was returned and whilst it is a bit tight on the forehead for me it is quieter and doesnt leak even in torrential rain so there really is no excuse - the dealer even suggested all flip up helmets leak at one point! My friend bought a C4 at the same time assuming as I did tha5 they would have sorted out the C3 Pro issues - his leaked as well - but experienced exactly the same issues as me. He is waiting for his to come back. I really feel the faults with these helmets should be publicised, it does seem some people dont have problems, but I am sure there are both lots of people who havent been out in the rain with them or think it is something they have done wrong, as I did initially with the C3. I think Schuberth and the dealers are very slick at getting bad reviews removed, I remember a bike magazine review a couple of years ago that said they leak like a sieve and it was disgraceful but there are no signs of the review to be found on the net now that I can see. It will be interesting to know how you get on. I would suggest anyone that suspects theirs might be leaking holds the helmet under a slow running tap above the hinge mechanism and watches very carefully around the bottom rubber below. Love to hear how you get on with your return.