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The Rocks are designed for young swimmers that need comfortable swim goggles for prolonged use. They feature a classic round lens shape that is also slightly curved for excellent peripheral vision. Lenses feature external anti-scratch treatment, UV protection and internal anti-fog treatment. TPR gaskets around the lenses form a comfortable, watertight seal. 100% hypoallergenic silicone strap for maximum comfort and fit. Strap and buckles are interchangeable with all other Cressi goggles and masks in the swim line. Offered in a variety of colors and lens tints, including a mirror lens version with black silicone.