The poagies are made of windstopper fleece material that is cut from a pattern and sewn together on a sewing machine. The poagie allows just enough room for your arm and the ski pole to enter and not allow air movement. The design depends somewhat on the size of the ski handle and the amount of insulating layers you want to use and should be modified accordingly.
Step 1: Gather Materials
Sewing Machine--you don't really need one if you can hand sew it--but it sure helps for neatness.
Wife/Girlfriend to sew these things--if you're female you probably know how to sew--I never got this training so spare your partner a lot of grief and don't try to use this machine for the first time by yourself on thick fabric like this stuff.