Is there a way to Stretch out a mask?

I have a Ghastly Productions H6 mask and it’s a little tight on me. I was just wondering if there was a way to stretch out the mask to make it fit better.

Id say stick rags in the mask IDK if it would really strech it out but it would feel alot better.:)Hope it helps:)

Slit the back a little further.

yes slitting the back alittle higher is the only thing you can do. ther is no way to permanently stretch the mask to make it bigger
and obviously if its already tight you wouldnt want to stuff anything in it to make it tighter.