Giotto wheels 63 mm dia.

To ensure a perfect fit, measure the circumference of your head starting from the center of the forehead and match it with the following sizes: fit, measure the circumference of your head starting in the middle of your forehead and match it with the sizes below:

XS/S 20 – 21.25 in (51 – 54 cm)

S/M 21 – 22.5 in (53 – 57 cm)

L/XL 22.5 – 23.5 in (57 – 60 cm)

XL/XXL 23.5 – 24.5 in (60 – 63 cm)

S - Small Waist: 66 - 76.2 cm / 26" - 30"
M - Medium Waist: 73.7 - 83.8 cm / 29" - "33"
L - Large Waist: 81.3 - 96.5 cm / 32" - 38"
XL - Extra Large Waist: 91.4 - 106.7 cm / 36" - 42"

JR: 5 – 6 in (12.2 – 15.2 cm)
S:  6 – 8 in (15.2 – 20.3 cm) 
M:  8 – 10 in (20.3 – 25.4 cm) 
L: 10 – 12 in (25.4 – 30.5 cm) 
XL:12 – 14 in (30.5 – 35.6 cm)

KP 22 Knee Pads 
JR: 11 – 12.5 in (28 – 32 cm) 
S: 12.5 – 14.5 in (32 – 36 cm) 
M: 14.5 – 16 in (36 – 40 cm) 
L: 16 – 17 in (40 – 44 cm) 
XL: 17 – 19.5 in (44 – 50 cm) 

KP PRO knee pads 
S:12.5 -14.5 in (32-36cm) 
M:14.5 -16 in (36-40cm) 
L: 16 -17 in (40-44cm) 
XL: 17 - 19.5 (44-50cm)

JR: 5 – 6 in (12.2 – 15.2 cm)
S:  6 – 8 in (15.2 – 20.3 cm) 
M:  8 – 10 in (20.3 – 25.4 cm) 
L: 10 – 12 in (25.4 – 30.5 cm) 
XL:12 – 14 in (30.5 – 35.6 cm)

S: 7.0 - 8.0 in / 17.78-20.3 cm
M: 8.0-9.0 in / 20.3-22.8 cm
L: 9.0-10.0 in / 22.8-25.4 cm
XL: 10.0-11.0 in / 25.4-27.94 cm

XS/S: 20-21,25 in / 51-54 cm
S/M: 21-22,5 in / 53-57 cm
L/XL: 22,5-23,5 in / 57-60 cm
XL/XXL: 23,5-24,5 in / 60-63 cm

S: 12,5-14,5 in / 32-36 cm
M: 14,5-16 in / 36-40 cm
L: 16-17 in / 40-44 cm
XL: 17-19,5 / 44-50 cm