It isn't as snug as other frameless masks like the Cressi F1 mask. We believe Hollis have tried using to reinforce rigidity from the mask for toughness and safety by strengthening the skirt material meaning it may pinch and dig When the mask is not really a proper fit in https://silicone-for-mask-making83837.blogozz.com/27995533/5-simple-techniques-for-silicone-laryngeal-mask-price