Spaulders are pieces of armour in a harness of plate armour. Typically, they are a single plate of steel or iron covering the shoulder with bands (lames) joined by straps of leather or rivets. By the 1450s however, they were often attached to the upper cannon or rerebrace, a feature that continued into the 16th century.
The use of spaulders developed during the 15th century, appearing often in the 1420s. Unlike pauldrons, spaulders do not cover the arm pits. Instead, the gaps may be covered by besagews or simply left bare, exposing the mail beneath.