Krios Pro Helmet Size Chart:

HEAD CIRCUMFERENCE (cm) 53-54 55-56 57-58 59-60 61-62 63-64 65-66
HELMET SIZE XS S M L XL 2XL 3XL
SHELL SIZE M M M L L L L
EPS SIZE M M M L L L L
COMFORT LINER XS, S, M L, XL, 2XL, 3XL
CHEEK PAD SIZE XS -30mm, S-25mm, M-20mm (M-15mm) (L-30mm), L-25mm, XL-15mm, 2XL-15mm, 3XL-10mm
CHEEK PADS XS-MD 30mm, SM-MD 25mm, SM-MD 20mm, (SM-MD 15mm) (LG-3X 30mm), LG-3X 25mm, LG-20mm, LG-3X 15mm, LG-3X 10mm

Krios Helmet Size Chart:

HEAD CIRCUMFERENCE (cm) 54-55 56-57 58-59 60-61 62-63 64-65
HELMET SIZE S M L XL 2XL 3XL
COMFORT LINER S, M L, XL, 2XL, 3XL
CHEEK PADS S-25cm, M-20cm L-25cm, XL-20cm, 2XL-15cm, 3XL-10cm

F5 / F5 Koroyd Helmet Size Chart:

HEAD CIRCUMFERENCE (cm) 54-55 56-57 58-59 60-61 62-63 64-65
HELMET SIZE S M L XL 2XL 3XL
SHELL SIZE M L
EPS SIZE M L
COMFORT LINER S, M, L XL, 2XL, 3XL
CHEEK PAD SIZES (S-25mm), S-25mm, M-20mm, L-15mm, (L-10mm) (XL-25mm), XL-20mm, 2XL-15mm, 3XL-10mm