POSEIDON Black Line Mask

The frameless Black Line does a good job of bringing the lens in close for an uninterrupted wide-angle view. The nose pocket is roomy but soft enough to make for easy clearing. The skirt is wide and soft, with a smooth finish that sealed well and was comfortable. As with some of the other masks in this category, the lens is angled slightly downward to increase visibility in that direction. That helped the Black Line earn a very good score for field of view. The push-button buckle is straightforward, and divers rated the adjustment very good. The strap is comfortable, although it has a longer split than most; it works well with a hood, but bareheaded, the top split can ride up on the head. For a large mask, the Black Line has a minimal internal volume that made clearing easy enough, even after intentionally flooding the mask.