The 10.1 Marathon Pro Dry Dynamic Rope by Sterling Ropes is considered by the outdoor industry and climbers alike, to be one of the most technically advanced ropes in the world. Quite a statement really, but when you break it down and look at their heavier denier nylon sheath construction, high tech Better Braid technology and proprietary DryCore maintenance of critical strength and stretch qualities in wet or icy conditions, you will actually agree. Every climber has to have two top quality things when setting off on a route, a good solid rope and and even better belayer. You have to take care of your partner, Sterling takes care of the rope for you. The Marathon Pro Dry Rope also is made with their proprietary DryCore technology, that will help maintain the original strength and elongation of your rope in wet or icy conditions. All of Sterlings ropes are treated with DryCore but dry treated ropes then go through a process to treat the sheath and in turn also treats the core again. According to Kurt Smith, Sterlings rep, This is a pain staking process - we double dip the rope and do the treatment twice to really get it to bond to the nylon.. There is a 5 extra shipping fee due to the extra cost of shipping a heavy package. Rock/Creek pays the remainder of the shipping fee which averages about 10 to most locations.