Height and Width Adjustability: Most standard shoulder rests include threaded feet or screw mechanisms to raise or widen the frame, allowing players to customize the fit for their specific neck length and shoulder shape. Slip Prevention: Grips the body securely so the violin stays in a stable horizontal or tilted position without requiring heavy downward pressure from the chin and jaw. Tension and Fatigue Reduction: Elevates the instrument to promote a neutral, relaxed spine and neck posture, lowering the risk of long-term muscle strain or injury during long practice sessions. Portability: Lightweight designs (often weighing under 60 grams) make them easy to detach and store inside standard violin cases, sometimes featuring collapsible feet for compact storage.