Frameless masks earn their keep by getting out of your way, and the Sigma is a good one. Bonding the single lens straight to the silicone skirt drops the volume and the weight, so it clears in one short breath and folds flat into a BC pocket as a backup. The wide single window opens up your peripheral and downward view, which matters when you're reading a computer on your wrist or watching where your fins are. Easy-adjust swivel buckles snap on and off without tools, and six silicone colorways mean you can match the rest of your kit.
