The smart uses a very unusual method of sealing out water & wind from the sides of the top. Rather than attach the top to the side bars and fold the entire thing they tension the top from the front and rear like a giant sunroof. This means that the sides are held tight against the soft seals by the tightness of the top. Yes, you can get your finger in there if you try, but unless you (or your car wash) spray directly against the side there is little likelihood of water entry. Now what will happen in 10 years when the sun and ozone have weakened the seals is another matter, time will tell. I bought two cabrios, knowing all this so you can see I am not too concerned.