This post surely has answered many of my questions. Good Post GOLARGE
"Widsom without Kindness and Knowledge without sobriety are useless."
My apologies for not responding sooner. I apparently hadn’t looked at this particular thread. I momentarily got hung up on the idea of applying heat while pumpung. Then after a period of time, mine varies between five and ten minutes, jelqueing for perhaps 100 jelques. Awsome feel. Anyway , to your question; the sweatshirt underwrap is simply a strip long enough to overlap each turn a small amount, perhaps 3/8 inch and wrap the whole length of what ever your upper wrap is, I use theraband(grey). I’m absolutely amazed at the difference in comfort. I hadn’t used this before, even though it is Bigger’s recommended underwrap, ‘cause I didn’t have an old ,worn out sweatshirt. The difference in comfort, for me would make it worth some considerable effort to find some of this material. Try it, you’ll love it.