Each horse in a race has to carry a certain amount of weight. To make sure that it does so, all jockeys must weigh out before a race to make sure they and their kit (including the saddle) are the right weight. If a jockey is lighter than the weight the horse has to carry, the difference will be made up by thin lead weights in a special saddle cloth.
Here you can see Christophe Soumillon on the weighbridge.
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