There's a reason that the Petzl Ascension Handled Ascender is the most popular ascender for big wall climbers. Its simple, functional, ergonomic design makes it the choice for any aid line out there. The thumb catch makes it easy to partially release the cam and ease your progress low on the pitch where rope weight isn't helping you yet. Wet, muddy, or icy ropes' Not a problem for this ascender's super aggressive teeth. Petzl also added a top carabiner loop as an additional security measure for when you're cleaning the Great Roof.