It is not as snug as other frameless masks including the Cressi F1 mask. We feel Hollis have attempted to reinforce rigidity from the mask for sturdiness and safety by strengthening the skirt product which means it might pinch and dig If your mask is not a proper in shape https://shanekkiwk.canariblogs.com/5-simple-techniques-for-m3-gas-mask-ebay-43687977