Thermoplastic rib protector from the racing brand Sparco. Easily adjusted with the ultra-strong Velcro straps.
Available in sizes:
140 (child size) - Chest 68-71cm
XS - Chest 86-89cm
S - Chest 94-97cm
M - Chest 102-105cm
L - Chest 110-113cm
XL - Breast 118-121
XXL - Breast 126-129cm
Measured about 5 cm below the armpit.