Cyclists are vulnerable to weather and commonly experience problems as they relate to extremes in both heat and cold. Educating cyclists on prevention of sunburn, dehydration, heat illness, hypothermia, and frostbite is the key. Limited sun exposure and proper use of sunscreens are the mainstay of treatment for prevention of sunburn. Adequate fluid and electrolyte replacement is necessary to avoid problems with dehydration and heat illness. Wind- and water-resistant clothing is recommended to protect against hypothermia and frostbite. Adequate training and acclimatization are, of course, recommended to all recreational and competitive riders for safe cycling.