Chest strap size guidance

Measurement is taken from armpit to armpit, and it’s taken 15 cm / 6 inches below the armpits, as shown in the picture. The measurement is only taken at the front of the chest, not around the body.

Size Range (mm) Range (inches)
0 <421 <16,57
1 421 447 16,57 17,6
2 448 473 17,64 18,62
3 474 501 18,66 19,72
4 502 536 19,76 21,1
5 537 578 21,14 22,76