Leather Armor & Helmet
This is a suit of armor made of pieces of heavy leather similar to saddle leather, and softer leather similar to a leather jacket. Torso and lower limb protection is in the form of harder leather, beneath which a leather coat is worn. This type of armor was not frequently used in Europe but does appear in Central and East Asian steppes where leather was relatively cheap and iron relatively scarce, Mongol light cavalry troops apparently sometimes wore leather armor of this type.
The first row with the high DR represents the protective quality of the helmet, the second row represents the protective quality of the leather armor alone. See Armor Table Key, Layered armors for more about how this works.