To the Editor.— Bicyclists are likely to suffer from a number of maladies, including dysuria, 1 numb penises, 2 and more. During cool or cold weather, another problem, bicyclist's nipples, may occur. This condition is similar to jogger's nipples, 3 but it is primarily a thermal injury instead of an irritation secondary to friction, as with the jogger's complaint. Often the rider is out in the cold weather for some time, and his or her undershirt, jersey, and jacket can become moist from perspiration. Evaporation and the chill of the wind lower the temperature of the nipples. They get downright cold, and they hurt. The pain continues after the ride is over. Indeed, it can continue for several days. The nipples are sore, sensitive to both temperature change and touch. Another ride while the condition is present can be extremely uncomfortable. Treatment consists of the passage of time and the