Arena One Mask training goggle is has a unique design that covers more of the face providing a watertight seal and an improved peripheral vision. Arena swimming goggle primarily designed for professional Swimming players. The goggle is designed for a perfect fit and adjustable split strap, suitable for fitness swimming. best swimming glasses in this price segment. The One Mask is the newest addition to the Arena swim gear line, it is designed to fit most faces and features special seals that avoid areas around the eyes, ensuring a watertight seal and long-lasting comfort.The One Mask is a great tool that offers a comfortable and secure fit while swimming in the pool.