Snorkeling mask is free size. Size of fins: S/M: US4-8, EU36-41, JP 22-24, total length 40.5cm/15.9in, width 19cm/7,4in; ML/XL:US9-13, EU42-47, JP 25-27, total length 42cm/16.5in, width 19cm/7,4in; TEMPERED GLASS WITH ANTI-FOG FILM: Diving mask Snorkel goggles are made of impact-resistant Tempered glass with ANTI-FOG FILM, which can fully absorb water vapor to prevent fog from being generated in the lens, so that you can capture more beautiful sea view underwater without fogging during snorkeling diving swimming. NO LEAK AND ADJUSTABLE: The snorkeling mask with soft liquid silicone skirt creates a strong and comfortable seal without worrying about water leakage. Adjust elastic silicone strap can be adjusted to fit different face shapes including men women teenagers. Note: This snorkel mask isn't suitable for people whose nose bridge exceeds the forehead. DRY TOP SNORKEL: The dry snorkel of the snorkel set designed with a splash guard and purge valve, which can prevents the water from entering the snorkel when you descend below the waterline and the purge valve at the bottom of the snorkel allows you drain the water out of the snorkel, just simple exhales. COMFORTABLE: The snorkel and mask set are made from food-grade silicone and comes with great comfort. The food grade silicone mouthpiece allows prolonged using without any discomfort. The snorkel set is suitable for adults youth mens and womens. ADJUSTABLE STRAPS AND BUCKLESOpen heel design and adjustable straps make the swim fins suitable for different foot types and sizes, perfect to share with your friends and family, in addition it will let small pebbles and debris fall. The important part is the quick release buckle that keeps strap's length of the you have set, so you don't need to adjust the straps for every use, easy donning and doffing. PERFECT SWIM PARTNER Snorkel Fins with scientific design, minimize fatigue and prevent cramps, it uses the unique open toe and cool flame shaped mesh instep design, it will help to reduce resistance and you will feel more comfortable and breathable. It's can be used with water shoes and water socks (Reminder: Please purchase sizes up if wear with dive booties together).