Comfortable, watertight and provide excellent, wide peripheral vision. Designed to fit various face types. Easily adjust to fit adults. Magna Jr. models adjust to fit children. Featuring a hypoallergenic, silicone gasket for a watertight seal, a unibody design to fit various facial types and speed adjustment for quick and easy sizing, this swimming mask is perfect for recreation.All polycarbonate lenses include full UVA/UVB protection.