Ben, you may not get a straight answer.
I went down this road two years ago when I was seeking some ultralightweight "camp shoes." Some web sites will just list a weight and then won't tell you whether it is for one shoe or one pair. They sell shoes by the pair, so you would think that the specifications like weight are by the pair, but that is not necessarily the truth. Further, if you telephone to a retailer to ask the question, you may not get a straight answer there either. If the product literature says "5 ounces," then that is all that they know. One retailer told me "6 ounces per pair," so I purchased them online and received them. They were slightly more than 6 ounces each. So, I called back to the same retailer and asked the question again, and I got the same wrong answer.
I guess you almost have to walk into a store in person with your digital scale in your pocket.
–B.G.–