UNISEX FREE SIZE (stretchable):

Size of sleeve 
9cm by 11cm by 37cm

If you have slightly muscular/bigger arms, you might want to select the "BIGGER" version, size at 11cm by 13cm by 43cm

Please note that the logo on the sleeves could be either "hicool" or "topcool" as we get our sleeves from different suppliers. (see picture below)
However, the material are of the same quality cooling type.