The 10.0MM Virus rope is neither too thick or too thin to improve control and durability. The Virus is smooth handling in all belay devices and great for every aspect of climbing. Part of Beal's Active Line which is designed to cover the largest range of climbing disciplines possible without the use of chemical treatments or dye. The Virus is made using only nylon from Bluesign certified sources. The Virus has excellent impact absorption and low impact forces.