MP Michael Phelps Xceed Swimming Goggles Mixed, , Patented curved lens for expanded field of vision allows the swimmer to see walls and the competition without altering head position. 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. Ultra soft Softeril gasket provides a watertight seal and maximum comfort.