The most unique feature to the Swift FX Bella has to be the Bella loops. The Bella loops fit comfortably around the ear and stay out of your hair for a more streamlined look and feel. The Bella loops are made with silicone similar to the Swift FX For Her Cushions. The Bella loops rest gently on your face and tuck away behind your ear and provide a new level of soft stability. ResMed has had so much success with the Swift FX For Her but they are always listening to customer’s needs and looking for ways to improve their product line.