Very supportive -
Great support and didn't fall down or move once even on a marathon.
smart, good material bit tight, No actual girths given for sizes S M L
I think it is essential that calf girth measurements are published to go with only the three sizes, S,M,L available for this product. Would have gone for a XL in other models / makes for a more comfortable fit. Would not want to wear them for runs over 6 miles. Description of product would be better without the word 'Red' in it. There isn't any red, only black and white !