The harsh environment of Dorne means that House Martell cannot equip their troopers with as heavy armor. However, what the Sunspear Royal Guards may lack in thickness plating, they make up for with the regimen of training they go through in order to keep the House safe from attack.
The Sunspear Royal Guard unit box for the A Song of Ice and Fire: Tabletop Miniatures Game gives House Martell players a rugged unit for their army. Their training makes them adept at attack and defense, hitting enemy weak spots and creating a shield wall to turn aside enemy attacks.