How much at maximum?
No maximum or minimum
Extreme restraints maybe: https://www.extremerestraints.com/hoods-and-muzzles_21/
Or something like that: https://www.bdsmstore.de/masken
Heve a look here https://www.sextoy-discount.com/Hoods_und_Augenbinden/cat5343031_4147215.aspx
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