I had bought 6 pairs of these briefs in a size small direct from an Under Armour store in Abu Dhabi and was very happy with them, so I ordered 4 more pairs in the same size - small - from here. I have attached 2 pics. The ones I bought in the store are at the back of the full picture, and at the top of the labelling information. As you can see, the ones bought from this seller are much smaller. The width is not an issue as they stretch, but the crotch is extremely small so the underpants don't even cover from leg to leg. It feels like I'm wearing children's underwear which makes these normally comfortable pants a little bit difficult to keep in the right place! The ones I bought from the store have the familiar SM/P/P sizing information on them but the new ones do not. Using an online converter to find out what 155/64A means, it says that is Chinese sizing and converts it into a UK size 6, which much smaller than a size small!! To help others buying these pants, I would normally wear a UK size 10 in underpants on a 29" waist. The size chart attached to the product puts me right between a small and a medium, which also didn't help me get the right size. Part of me wonders if these are genuine products as if you're selling in the UK, the sizing should be familiar for the UK market... Having said that, the quality of the material seems to be the same as the others.