MP Michael Phelps Xceed Mirror Swimming Goggles Mixed, , Patented curved lens for expanded field of vision allows the swimmer to see walls and the competition without altering head position. Silver Mirror coating to enhance sun light protection. Engineered with Exo-Core technology, which combines two materials for maximum performance. Compressed Micro-Gasket provides a leak resistant seal and a low profile design. Semi-rigid exoskeleton maximizes the structural strength and stability of the goggle.