The Synergy Twin benefits from SCUBAPRO’s second-generation Trufit Technology, a skirt made of two thicknesses of silicone – thin and pliable where it touches the face for comfort and to ensure a watertight seal, and thicker near the mask frame for support and rigidity. It’s an effective combination that delivers a comfortable fit for a wide range of face shapes as well as a reliable seal against water intrusion. The duallens design is low volume and offers a wide field of view.