Like most Alpinestars gloves, these gloves run a bit smaller than most glove brands we carry. If you are sometimes between sizes, then choose the larger of the two. Hopefully you’ve had some experience with buying gloves and can choose based upon the fit of a previous pair. If you have no previous experience with glove sizing, go here for help.
With is particular glove, It seems to fit just a tad larger than past Alpinestars glove, which makes it more closely comparable in size to other brands sold in the US. Also, it seems the finger length is more generous, so if you’ve had trouble with the fit of AS gloves in the past… particularly with regard to finger length, you might want to give this new version a try.