The CAMP USA Kasama 9. 7 is built for climbers who put real mileage on their gear: the gym regular logging dozens of sessions a month, the sport climber projecting the same route through a hundred falls. The 9. 7mm diameter gives the sheath more material to absorb abrasion, and the dry treatment keeps dirt and moisture from working into the core over time. Both extend the rope's working life well past what a lighter, thinner option would offer. What Our Gearhead(R) Experts Are Saying:"I reach for this rope on high-volume gym days because the 9. 7mm diameter absorbs repeated falls without the sheath going fuzzy the way thinner ropes do after a season of heavy lowering."