The IonR is the largest diameter rope in the fusion range. Our core construction improves all the specs, but retains the handling characteristics that won the original such a loyal following. The most substantial rope of the Fusion series, it remains a lightweight, high performance entrant. It's unique design is manufactured by first twisting multiple colored fibers into a single sheath strand and then braiding the sheath to create the speckled pattern. It's diameter is a great size for intermediate climbers looking to match a lightweight rope with performance while knowing that the diameter isn't TOO thin for a beginner belayer.