We started the EVA late or so and immediately had problems with air flow in the packs. Air flow is way down and very, very problematic. Though the ambient temperature was pleasant, in the jumpsuits and helmets, we heated up very quickly. We could not complete the slope climb to scout the fossil oyster bed and returned to the Hab area. Jorge went through various postures with his backpack design and we photographed him. After that, Peter called a termination on the EVA.