A medium fit / large fit swim mask, The One Mask goggle has durable lenses and soft seals that adapt to most faces; Please be advised, this design may not be suitable for smaller faces Exclusive gasket design provides an excellent fit and delivers great protection with special Orbit-Proof seals that prevent water leakage by avoiding areas around the eyes that compromise suction The special gaskets ensure an extended field of view and the durable anti-fog treated polycarbonate lenses provide comprehensive, crystal-clear vision while swimming and training Constructed with a self-adjusting nose bridge and an easily adjustable split strap for a secure and comfortable fit, even for swimmers with long hair; Perfect for fitness swimming Ideal for recreational and regular swimmers looking for a beautiful swim mask goggle with superior fit and unbeatable, long-lasting comfort; Also available in a mirrored lens