The National Geographic™ Snorkeler Marlin 1 Masks are part of the Explorer Series products and are extremely popular. The quality is equal, or greater, to what you’ll find at dive shops. The Mask is made from Hypoallergenic, 100% silicone and features tempered lens for distortion-free clarity. Lightweight frame with a pliable and non-feathered nosepiece for ease of draining and feathered edge seal on the mask skirt. The strap is flexible and replaceable with a three-point hold and ratchet quick lock. Available in 3 colors. Blue/Clear Silicone, Black/with Clear Silicone and Yellow/with Clear Silicone. Available in 1 size; Standard fitting most adult faces.