 Participants will be ultra-endurance athletes competing in Racing the Planets 250 mile7 day 4 Desert events in 2014 Jordan, Gobi, Madagascar, and Atacama. A convenience sample will be used, with full consent signed before inclusion into the study, with participants being informed that study inclusion is entirely optional and will not affect medical care. Randomization will be conducted for each participant, a coin will be flipped to determine which foot is to be taped, heads - right foot, and tails, left foot. The non-taped foot will be used as a control. The runners normal sockshoe system will be used to reflect natural wilderness conditions. Participants will have demographic data collected prior to the race, including age, gender, country of origin, number of marathons run prior, pack weight, and sock type. The study endpoint occurs when a hot spot or blister develops on either the treated or untreated foot. Runners will be instructed to treat suspected blisters or hot spots as they normally would, and to inform the study administrators the same day for visual inspection and final questionnaire to determine if they develop blisters or hot spots, whether they applied or re-applied tape themselves, removed tape, and the reasons for these actions. 