Helmet Manufacturer Sizing Charts
Aegis
Helmet Model Head Circumference (inches) Helmet Size Hat Size Conversion
Junior Pony 19 to 21 1/4 XS 6 to 6 3/4
Useppa 20 1/4 to 21 7/8
21 7/8 to 23 1/2
S/M
L/XL
6 1/2 to 7
7 to 7 1/2

Charles Owen
Head Circumference (cm) Helmet Size Skull Cap Size
49 6 000
50 6 1/8 000 1/2
51 6 1/4 00
52 6 3/8 00 1/2
53 6 1/2 0
54 6 5/8 0 1/2
55 6 3/4 1
56 6 7/8 1 1/2
57 7 2
58 7 1/8 2 1/2
59 7 1/4 3
60 7 3/8 3 1/2
61 7 1/2 4
62 7 5/8 4 1/2
63 7 3/4 5
64 7 7/8 5 1/2
65 8 6

GPA  
Head Circumference (centimeters) Helmet Size
53 6 1/2
54 6 5/8
55 6 3/4
56 6 7/8
57 7
58 7 1/8
59 7 1/4
60 7 3/8
61 7 1/2
62 7 5/8

IRH  
Head Circumference (inches) Helmet Size
20 6 1/2
20 1/2 6 5/8
21 6 3/4
21 1/2 6 7/8
22 7
22 1/2 7 1/8
23 7 1/4
23 1/2 7 3/8
24 7 1/2

Samshield  
Head Circumference (cm) Head Circumference (inches)
52 6 1/2
53 6 5/8
54 6 3/4
55 6 7/8
56 7
57 7 1/8
58 7 1/4
59 7 3/8
60 7 1/2
61 7 5/8
62 7 3/4

Tipperary    
Head Circumference (inches) Helmet Size Hat Size Conversion
19 1/2 to 19 7/8 XS 6 1/4 to 6 3/8
20 1/4 to 20 3/4 S 6 1/2 to 6 5/8
21 1/8 to 21 1/2 M 6 3/4 to 6 7/8
21 7/8 to 22 1/4 L 7 to 7 1/8

Troxel    
Head Circumference (inches) Head Circumference (cm) Helmet Size
20 51 6 1/2
20 1/2 52 6 5/8
21 53.5 6 3/4
21 1/2 54/55 6 7/8
22 56 7
22 1/2 57 7 1/8
23 58.5 7 1/4
23 1/2 60 7 3/8
24 61 7 1/2
24 1/2 62 7 5/8
25 63.5 7 3/4

Uvex    
Head Circumference (cm) Helmet Size
52-55 2XS/S
55-58 S/M
57-59 M/L
60-61 L/XL

Curious?
Have you ever wondered how hat sizes are determined? Hat sizes are calculated by dividing head circumference in inches by the value of pi, which is known to be the ratio of the circumference of a circle to its diameter, and which is said to have a value of 3.14. For example, a head circumference of 22 inches divided by 3.14 equals 7.00-or a size 7 hat.

For more assistance or to request a catalog, call 1-800-989-1500 to speak with a Dover Saddlery product advisor, or stop by any of our retail stores. Visit DoverSaddlery.com for a complete store listing and the full product offering.

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