Anon Helmet Size Chart

Wrap a soft tape measure around your head just above your eyebrows and ears, keeping it level all the way around, and note the measurement where the tape overlaps. Anon helmets come in two shapes: Regular Fit is for oval heads (longer from front to back than from ear to ear) and Round Fit is for rounder heads where those two measurements are similar. If a Regular Fit helmet presses on the sides of your head, try a Round Fit; if a Round Fit presses at the front and back, Regular Fit should feel better.

Adult helmets – Regular Fit

Size	Head circumference	Approx. inches
S	52 – 55 cm	20.5 – 21.7 in
M	56 – 59 cm	22.0 – 23.2 in
L	60 – 62 cm	23.6 – 24.4 in
XL	63 – 64 cm	24.8 – 25.2 in

Adult helmets – Round Fit

Size	Head circumference	Approx. inches
S	55 – 57 cm	21.7 – 22.4 in
M	57 – 59 cm	22.4 – 23.2 in
L	59 – 61 cm	23.2 – 24.0 in

Kids' helmets – Regular Fit

Size	Head circumference	Approx. inches
S/M	48 – 51 cm	18.9 – 20.1 in
L/XL	52 – 55 cm	20.5 – 21.7 in

Kids' helmets – Round Fit

Size	Head circumference	Approx. inches
S/M	51 – 53 cm	20.1 – 20.9 in
L/XL	53 – 55 cm	20.9 – 21.7 in

Based on Anon's official helmet size guide (centimeters). Inches are converted and rounded; when you are between sizes, go by the centimeter measurement. Round Fit is offered on select models only, and adult Round Fit helmets stop at size L. Questions? Give us a call and we'll help you find the right fit.