At Framheim, Amundsen continually upgraded his equipment, since he was largely dissatisfied with standard polar gear. The
sledges were refined by shaving down portions of their frames and runners, achieving a 60% weight reduction without compromising their overall strength. Amundsen designed special sledge-cases for food and equipment that remained permanently lashed to the sledges, with access through a lid that could easily be pried off without the need to remove mitts. This saved the time of unloading and re-loading packing boxes when making and breaking camp while on the march, and also eliminated the risk of frostbite when unpacking the
sledges. The sledge-cases were also refined during the winter by planing down the wood to reduce their weight. Further, food selection and packing had been refined for both efficiency and maximum space usage. Amundsen brought only four foods:
pemmican (made according to his own recipe), chocolate, milk powder and biscuits, although this diet was supplemented by seal and penguin meat stored in the supply depots on the Barrier, and by fresh dog-meat from the dogs that they culled during the journey. This fresh, vitamin-rich meat in their diet prevented the onset of
scurvy. To prepare for the trip to the pole, the ski bindings were fitted with hooks so they could be removed during sleeping hours and hung inside the tent. Since the bindings were made of leather, the ravenous sledge dogs would often gnaw at them when the men were asleep. Footwear and the risk of frostbite was a major concern for Amundsen, especially after some negative experiences during the autumn depot-laying trips and the abortive first attempt to reach the Pole. He and his men re-constructed and refined their ski-boots several times before the final polar journey, to obtain maximum insulation against the cold and to provide the necessary flexibility for skiing. Each man brought spare boots in case of breakage or malfunction, with the risk of debilitating frostbite outweighing the issue of weight. None of Amundsen's men experienced frostbitten feet during the polar journey, despite the extreme temperatures. == Fate of the base ==