I should also add that if you a just starting to ride fixed you should ride slow, without clips and get used to the sensation of fixed gear riding, learn skids and track stands. Then When you get more comfortable add cages, If you don't know how to track stand on a fixed gear you are going to fall over at the first stop light you get to riding with cages. Learning to skid is not as detrimental to your riding if you ride with brakes and use them, but it is a very useful skill to have when riding fixed and can make it a much more enjoyable experience.