what does it mean when they ask for a size and it gives you options between 80 mm to 120 mm?
141020
The option of between 80 mm to 120 mm is the length of the riser stem in millimeters.
28755
The helmet is sold by third-party sellers, not Amazon. I imagine one seller used the term "M" and another used "Medium" and the system just automatically included both of them. But both labels clearly refer to a medium size, so whichever one you choose, you will get a medium (though possibly from different sellers). I have only bought one of these helmets, so I can't answer your second question on the basis of my personal experience, but common sense suggests that there will be no difference.
443291
If you take a look at the front of any lens you will see numbers indicating the millimeters and the F range, these numbers have nothing to do with the size of the filters the lens will accept. Usually there is a separate number set apart from the lens type numbers that indicates the proper size filter to purchase. On my lens I see a O with a forward slash through it (sorry I don't know how to type that symbol) followed by the number 55, so I use a 55 mm filter.
1170595
I ordered 440mm, but receiced 420mm. They were marked 440, however they measured 420. The size turned out ok and I did not return them. If you really want 440mm be sure they get measured prior to shipping as the packaging designation etc
681289
Once you order, the company will call you and ask the sizes that you want and they don't all have to be the same size. For example, I ordered a large helmet, but a medium jacket and glove.
511542
Look at the front of your lens, there is a number on it followed by MM this number is the size which you would be looking for to replace the lens cover size.
63090
there seems to be a mix up in their sizes listed.... i ordered a 12in but got a 10 in
1546996
Mine was also 28mm. Company only offers 24mm as alternative, and you can't buy them alone. You'd have to buy a whole extra collection kit.
382352
I did not have the option to select a size, but they sent me the 28.5. I wanted the standard size... beware.
827149
They come in different sized ans shapes. Use the information provided to determine what will fit for you.
251101
Usually the pkg has some indication of size range . Sometimes they have guide lines on them and you cut to size. Hope that helps
701963
I can't remember what sizes they offer but in general for earplugs medium fits most people. I just know I have small ear canals so I need small.
1726490
The description text says these are 56-18-130, which means 56mm lenses (horizontally), which does seem nice and wide (Wayfarer-style lenses are 50-54mm), 18mm for your nose, which is bigger than average (itty-bitty lady = 15mm; big dude nose = 22mm), and 130mm for the handles to reach back to your ears. A bigger guy would probably want something closer to 145mm for that, but if these go straight, maybe they could manage to sit on top of your ears if they don't manage to get behind them. I would not recommend these on account of the short temple size (the 130mm), but you'd have to try them on to know for sure. The description text says these are 56-18-130, which means 56mm lenses (horizontally), which does seem nice and wide (Wayfarer-style lenses are 50-54mm), 18mm for your nose, which is bigger than average (itty-bitty lady = 15mm; big dude nose = 22mm), and 130mm for the handles to reach back to your ears. A bigger guy would probably want something closer to 145mm for that, but if these go straight, maybe they could manage to sit on top of your ears if they don't manage to get behind them. I would not recommend these on account of the short temple size (the 130mm), but you'd have to try them... » Read More The description text says these are 56-18-130, which means 56mm lenses (horizontally), which does seem nice and wide (Wayfarer-style lenses are 50-54mm), 18mm for your nose, which is bigger than average (itty-bitty lady = 15mm; big dude nose = 22mm), and 130mm for the handles to reach back to your ears. A bigger guy would probably want something closer to 145mm for that, but if these go straight, maybe they could manage to sit on top of your ears if they don't manage to get behind them. I would not recommend these on account of the short temple size (the 130mm), but you'd have to try them on to know for sure. « Show Less
791319
it refers to the number you get not size. worked for our windows really well!
1198761
Not sure what you are asking here? Are you asking about sizes or something else?
724199
The actual size is 120 mm, the product description is incorrect. Frustrated about the description, but very pleased with the performance of this product. I highly recommend it.
1263816
11.5mm,12.5mm, 15mm,20mm,18mm,23mm,25mm,30mm. Choose the size yourself ,but don't support mix size.