Do they have z87+ marked on the frames or lens?

It is marked Z87 on inside of both arms.

What maximum size of glasses to wear underneath these?

The closer to round your lenses are, the better. My lenses are about 6.5 cm wide each, and they don't fit. Max APPROXIMATE dimensions across your glasses of the temple pieces at the hinges: about 13.5 cm. Max width each lens of your glasses: abt. 5.5 cm. Max height each lens abt. 3.5 cm.

What are the measurements for the size of glasses these fit over?

Hi! A rough measurement of my prescription glasses: about 4.5 in from the bend in the arm to the lens. 5 inches across lens to lens. And, they sit maybe an inch from my eyes. These goggles mostly seal around my eyes with some space on each side about my cheekbones. I haven't tested them at any speed. I bought them to use when I started lessons--not riding fast or far at all, just the bike basics. I will look into prescription goggles when I get to serious riding.

Manufacturer	Cglasses
Brand	Cglasses
Model	Outfitterclaf ,1
Item Weight	0.01 ounces
Package Dimensions	7.6 x 4.45 x 2.32 inches
Item model number	8542061021
Is Discontinued By Manufacturer	No
Manufacturer Part Number	GV-OUTFIT-BK-CL-4
Special Features	100% UV400 Filter

Outfitter clear motorcycle glasses. Over-Prescription glasses

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