xcoser Veteran Ranger Helmet Resin Fallout Mask Halloween Cosplay Costume Accessory Prop

is this item in stock, I don't have all the money to buy this yet, but when I do I plan to buy this, it doesn't say anything about how many are availa

Is there any ventilation in it/Holes for breathing? And is it sturdy?

Will it fit my gigantic melon head? actually not that big, size 7 5/8 which is like xxl.

What are the lenses made out of?