Marathons are mere training runs for your ultra racing efforts, but you still use the Soleus Ultra Sole Watch to monitor the time. This watch is designed to go the distance, tracking up to 100 hours of long running, um, pleasure' The 35 lap memory means you can compare and contrast two 50 mile efforts. Five interval timers means you can track your pace in 10, 20, or 30 mile increments. Despite the slim size, the Ultra stores stats for up to 10 runs, tracking total time, best lap, and average lap. Three alarms ensure promptness wherever the ultra long road may lead you. Water resistant up to 100m, you'll welcome volunteers who douse you in water along the route of the Badwater 135. Running through the night can be spooky, but the 15 second EL backlight briefly takes away the eerie darkness and lets you check in on your progress.