Including a superb anti fog coating preventing excessive steaming up during high performance competitive races the mp michael phelps xceed swimming goggles feature a clear curved lens design for an unobstructed 180 peripheral eyesight making swim races and practices a real pleasure there is also a softeril material providing sealed fit preventing water leaking inside and the goggles are made from polycarbonate to ensure lightweight and resilient structure built to last the goggles arrive