Draughtex is designed for what you want. It's easy to install and is pretty much invisible once done. I linked to it upthread earlier today.
Cheers. Sorry to re-cover old ground. I'm a couple of pages out of date.
No worries.
@Cupcakes started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Draughtex is designed for what you want. It's easy to install and is pretty much invisible once done. I linked to it upthread earlier today.