I am an adult, but I am super small. I am 4'10'', 85 lb. Do you think it will fit my head?

I am not quite as small- but generally fit the very small end of the adult helmet spectrum, and sometimes have purchased children's helmets when necessary. This one fit me fine (and can be cinched smaller than I need, which is rare). I ordered on Amazon for the price savings, but I did go try it on at REI to figure out if it would work first. If that is an option for you, it can be a good idea: as another responder stated, different helmet brands (and even styles within brands) fit differently.

what size would a 6 & 1/2 hat size be? I am a women with a large madula

Your head would be 52 cm. not that big of a madula really :)

Hi, My head circ is 64 cm. i want to purchase an Atmos ll,but wondering if the Savant is a better fit for me?

My Giro Helmet is one the best for comfort, fit, weight, and style. No idea about the other. I have been riding for 30 years and it is on the top of my choices!

What is the difference between size medium/15" and medium and just m? are they the same size or not?

They are the same. It was just how the size was entered by a seller to Amazon.

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Giro Atmos II Helmet

Product ID: 215804563

Details

Brand
Giro
Color
Matte
Size
Large/15"
Outer Material
Polycarbonate
Item dimensions L x W x H
0.01 x 0.01 x

🎨Matte White/Black finish

⚖️Lightweight 0.4 lbs

🛡️Ballistic Nylon

Description

🚴‍♂️ Elevate Your Ride with Giro's Atmos II Helmet!

UNIVERSAL FIT - Designed for unisex use, fitting a wide range of head sizes.
SLEEK AESTHETIC - Stylish matte finish that complements any cycling gear.
READY FOR ADVENTURE - Perfect for both casual rides and intense cycling sessions.
FEATHERLIGHT COMFORT - Weighs only 0.4 lbs, ensuring you barely notice it.
UNMATCHED PROTECTION - Engineered with ballistic nylon for superior durability.

The Nit Ize Tool Holster Stretch expands to keep multi-tools and knives of almost every size securely and conveniently at your side.

Specifications

Brand	Giro
Color	Matte White/Black
Size	Large/15"
Outer Material	Polycarbonate (PC)
Item dimensions L x W x H	0.01 x 0.01 x 0.01 inches
Inner Material	Nylon
Item Weight	0.4 Pounds
UPC	768686546372
Global Trade Identification Number	00768686546372
Item Package Dimensions L x W x H	14.1 x 9.3 x 7.3 inches
Package Weight	1.3 Pounds
Item Dimensions LxWxH	0.01 x 0.01 x 0.01 inches
Brand Name	Giro
Suggested Users	unisex
Manufacturer	GIRO
Part Number	768686546372
Model Year	2016
Included Components	Atmos II Helmet - Matte White and Black - L 15

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