I've used the SKS Race Blades and Crud fenders, both of which are removable. They are both fine if you absolutely don't want permanent or semi-permanent fenders on your bikes. They will keep water from spraying up your back and do a fairly decent job keeping it off your feet and drivetrain. However, they do not work nearly as well as fixed or permanent fenders. The main problems I've had is getting them properly adjusted so they don't rub your tires or frame, as well as allowing adequate clearance for tires.

I got rid of my Crud fenders because they lacked clearance for tires larger than 23 mm. I still have the SKS Race Blades but seldom use them, opting instead to install "permanent" fenders on three of my bikes. We've had so much rain in NC the past two years -- as you know -- that I've just resigned myself to expect the roads to be wet much of the time. I removed the fenders from one of my bikes the summer before last and ended up not riding that bike hardly all summer due to all of the rain, and it's my favorite bike. So I put fenders back on it, but I have two other bikes without fenders that I can ride on sunny days, which seem to be more and more of a rarity in NC.