The Mares X-One Marea Set combines the Marea Mask, Sailor Snorkel & X-One Fin for everything you'll need for a snorkelling holiday abroad. A top of the range snorkelling set with designs taken from accross the Mares SCUBA Diving range. Marea Mask has a double silicone skirt for a large flat seal around the face to keep water out whilst spreading the pressure on the face that reduces red marks after use. Tear-Drop shape lens mimics the eye's natural field of vision so you see less of the mask frame whilst swimming. X-One Fins are a short blade style snorkelling fin designed from the top-of-the-range SCUBA diving fin the X-Stream. The netted pattern foot pocket allows for quick draining, easy removal & reduces the drag from parachuting. The Buckle Free Heel reduces weight & complications with a simple stretchy heel strap similar to SCUBA diving fins that will accomadate a wide range of foot sizes. Sailor Snorkel has a purge valve bottom that collects water away from the mouthpiece & pushes any trapped water out with every breath so you won't be breathing water with every breath. A corrugated section just before the mouthpiece angles it perfectly into your mouth, reducing jaw ache & providing a better seal. Specifications SIZE CHART SIZE EU UK US SM 35-38 2.5-5 3.5-6 ML 39-43 5.5-9 6.5-10 LXL 44-47 9.5-12 10.5-13