how do you determine the sizing for the helmet?

Measure the head of the person that will wear the helmet, compare measurement to the size chart. I suggest if you are close to the maximum size for a given helmet, order the next size up. I believe the chart is a bit optimistic.

What size for 20 inch head; what size for 23 in head?

For the 20" head the size chart indicates the XS/S and for the 23" an M/L. They are adjustable as well to get just the right fit, however the head sizes you indicate fit within the size range of the helmets per the size chart.

I wear a 7 5/8 - 7 3/4 helmet, will the large fit?

Sizes:XS/S (6 - 6 ½)S/M (6 ½ - 7)M/L (7 1/8 - 7 5/8)

Is this an adult helmet or just for children?

Hello,This helmet is worn by both children and adults depending on the size of the head. Below is a sizing chart: Please let us know if have any other questions.XXS/XS 46-50cm 5 3/4-6 1/4XS/S 48-52cm 6-6 1/2S/M 52-56cm 6 1/2 - 7M/L 57-61cm 7 1/8 - 7 5/8

Model Number	467566
Color	black (black 19-3911tcx)
Sport Type	Equestrian
Batteries Included	No
Product Dimensions	2.54 x 2.54 x 2.54 cm; 703.07 g
Use Object	Unisex-Adults

Ovation 乗馬用ヘルメット Deluxe Schooler

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