"The Kite Shield is a large shield that offers great protection but weighs down the wielder somewhat."
 Compared to the Tower Shield, you lose out on a substantial deal of coverage in exchange for a faster hold-up time and substantially better visibility (at least in the first person perspective). As a result, this weapon fits a more aggressive Knight who needs the faster guard time to react to enemy arrows or enemy swings.
Generally, its size makes the Knight more immune to incoming projectile attacks than the other shields in the game, (though beaten by the Tower Shield). It's recovery time is significantly faster compared to the Tower Shield, so this can be used if you're playing in an aggressive role.
Shields which are on player's backs will protect it's user from projectiles, but not melee damage.