All our Running Shoes are UK measurements:

For example a Mens UK 8 = US 9 = EURO 42.5
Women’s UK 6 = US 8 = EURO 40
Kids UK 2.5 = US 3 = EURO  35

All our Running Apparel sizings for Men are:

S(Small)  M(Medium) L(Large)  XL(Extra Large)  XXL(Extra Extra Large)

Womens Apparel are as follows:

XS (Extra Small)  S (Small)  M (Medium)  L (Large)
Size 8 (Extra Small) Size 10 (Small) Size 12 (Medium) Size 14 (Large) Size 16 (Extra Large) Size 18 (Extra Extra Large)

Childrens Apperal Sizings:

Age 7-8 years (Small) Age 9-10 years (Medium) Age 11-12 (Large)