When adjusted properly, a wrist sling promotes a relaxed grip and prevents bow torque.  A wrist sling should be adjusted in a way that it barely contacts the back of the hand while at full draw.  Its main purpose is to prevent you from dropping your bow and to allow a relaxed grip.  Another reason you need a Paradox BowSling is because they look great!  Match Your Bow,Team Colors, Or Just Add some color to any bow!