Snell E/III grills, please?

Hi: I am the original owner of a pair of Snell E/IIIs. I have never had the grills off, and when I try to remove them, they do not want to come. Anyone know if these covers are removable or am I at risk of damaging them if I keep on tugging?

Tucson, AZ
They are attached by some very good velcro. Be careful and go slow and you will be fine
Thanks! For all these years I thought they were not removable. You are right about strong velcro!