Depending upon the weather, the motocross rider may desire to have additional layers of clothing on for warmth. Although it is not necessary to wear clothing under the jersey, it may be advisable in several circumstances. The rider may desire to wear a t-shirt under the jersey to help keep it clean. This is especially true if the rider will be riding for several days without the opportunity to change the jersey or replace it with another one. Wearing an undershirt may also increase the lifespan of the jersey.