frame is fitting on your face, so do not need to worry about leakage. Double coated tempered lens is -fog and can withstand deep pressure. You will have a great experience with this nice diving goggles. Feature: TEMPERED GLASS LENS: Shatter resistant and scratch resistant lens to withstand deep pressure. CLEAR & FAITHFUL IMAGE: Double coated -fog lens offer a wide and clear viewing for free underwater exploration. SEALING: Soft and flexible liquid edge skirt perfectly fit on face to leakage. ADJUSTABLE: Simply pull the strap to desired fit and the buckle will secure the goggle in place. Specification: Material: + Tempered Lens Style: AM408 / AM308 / AM708 (optional) Lens frame size: AM408: 15.5 * 7cm / 6.1 * 2.7in AM308: 15.5 * 7cm / 6.1 * 2.7in AM708: 16 * 8cm / 6.2 * 3.1in Weight: 177-211g / 6.2-7.4oz Package weight: 185-219g / 6.5-7.7oz Package list: 1 * Diving Goggles