The Salamander Revisor easily attaches to any helmet (kayaking, biking, horseback riding, etc.) and stays there, even in the most demanding situations. It also flips up out of the way when needed. The Revisor is slightly smaller and lower-profile than the Salamader Beak yet affords great protection against sun and the waters glare. The Revisor measures 8" wide and the depth of the bill is 2.25".