Snorkel Mask Features: WIDE FIELD OF VISION 1.180 Degree Field of vision and shatterproof polycarbonate window for added safety. 2.Easy Breathing Full mask for natural breathing through the nose and/or mouth. 3.Anti-Fogging Exclusive breath ventilation concept prevents fogging. 4.Impermeability / Seal Dry Top snorkel system stops water entering through the top of the snorkel. 5.Water Drainage Purge valve at the bottom of the mask to drain water when the head is raised. 6.Easy Dressing Adjustable elasticated textile strap does not pull your hair out. Reminder: Surface mask, not suitable for free diving or speed swimming IMPORTANT INSTRUCTIONS BEFORE putting the MASK on your FACE, MAKE SURE you have ADJUSTED the ELASTIC STRAPS PERFECTLY for your FACE SIZE. Once the mask has been tightened to fit against your face, just pull the STRAPS ONCE AGAIN until NO GAP is left between your face and the silicone inserts of the mask. You have to feel the mask FULLY SECURED so that the WATER WON T LEAK INSIDE and you will be able to Snorkel as much as you want. How to choose the right size? Step 1. Measure the distance between Nose bridge to bottom of the chin. Step 2. If the distance is less than 12 cms or 4.8 inches, Choose Small/Medium. Step 3. If the distance is more than 12 cms or 4.8 inches, Choose Large/XL. Usage Tip: Please do not wear this mask if it can not be sealed well because of your beard, hairs or others. Sometime, a little leakage might happen due to heavy wave or speed swim or strap does not adjust well. Package included: 1 x Snorkel Mask (Camera not included)