The ecranche is a small shield, made of wood reinforced with metal and covered in boiled leather. It is worn high on the arm, over the shoulder. About the size of a buckler, an ecranche leaves the arm it is on entirely free for other uses, at the cost of reduced protection and slightly restricted movement. You take a –1 penalty to attack rolls with any weapon you wield using the same arm as your ecranche. You cannot make a shield bash with an ecranche. Strapping on or removing an ecranche takes one minute.
You do not receive an ecranche’s shield bonus (or enhancement bonus to AC or special abilities, if the ecranche is magical) when denied your Dexterity bonus to AC, or against attacks from foes that flank you. An ecranche is not so small that another shield may be worn on the same arm. A wearer not proficient with an ecranche receives no shield bonus to AC.