National Geographic Snorkeler Fit Traveler 2 Snorkel Combo S/M (men's shoe size 4.5-8.5; women's shoe size 6-10) M/L (men's shoe size 9-13; women's shoe size 10-12) Snorkel Mount on the Front of the Mask - Great for swimming Laps. Silicone mouthpiece for comfort. Wide Breathing tube for easy air displacement Lightweight vented Adjustable fins