We guarantee the quality of the product. If you are unsure about the size, you can contact customer service. Just tell us your height and weight, and we will match you with the appropriate size Recommended reference size height:150-155cm 40-45kg S height:155-160cm 45-50kg M height:165-165cm 50-55kg L height:165-170cm 55-65kg XL height:170-175cm 62.5-72.5kg 2XL height:175-180cm 70-80kg 3XL height:180-185cm 80-82.5kg4XL Size mearsured by ourselves, sometimes has some errors, but always within 3cm." Please note 1 cm = 0.39 inch,1 inch = 2.54 cm. Please feel free to contact us when finding difficulty in choosing size,we will give you the best option.