hedgehog47
Contributor
obviously the shape is different slightly but are there any other changes between the two masks ? thanks!
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Other than size, Hollis claims the M-1 has "Ultra Clear Glass" and the M-4 has "Standard Glass." I dive an M-4 as my primary, and an M-1 as my backup, but I haven't noticed the slightest difference between the two in terms of quality.obviously the shape is different slightly but are there any other changes between the two masks ? thanks!