The 9.8mm Evolution Velocity Bi-Color Rope by Sterling is the perfect compliment to your multi-pitch, mountaineering or just sport climbing adventure. With two different designs that represent both sides of the rope, you can easily find the center, even in low light, which is helpful on rappels when descending close to dark. This is a great attribute when considering, that studies done by Sterling, shows that marking the center of your rope with a felt tipped marker or other commercial ink can decrease up to 50 of the rope strength - or the energy absorption capacity of your rope. The Velocity 9.8 is lightweight, incredibly durable and easy to handle. Its silky smooth sheath repells abrasion and slides effortlessly to reduce rope drag. All in all this is an amazing rope that offers so many advantages, it might even give you that extra boost to the top.