XLPE (Cross-Linked Poly Ethylene) insulation is found in XHHW, or RHH/RHW conductor types and generally exceeds the specs of standard building wire like THHN/THWN, which have simpler PVC insulation, but have a Nylon (the N at the end) jacket that is used to resist abrasion when pulling.
Most of the cables found in IEC countries will in fact BE cables because they are most often sold as what is referred to as "mulit-core" cables with 3 or 4 conductors and a ground (earth) conductors surrounded by a sheath. PVC insulation on the conductors is very common there as well, but you can also get XLPE if you want it. I don't know that I have ever seen any IEC cables that have a Nylon sheath like we use though.