For the liner, I had a choice of blaze orange, digital camo, or charcoal, all in polyester. Or any bedsheet in the house. I may add a heavy mesh under the arms, I dislike the poly feel. The insulation will be poly batting. I am in the process of moving, and don't want to set up to blow down, although the quilting pattern would have allowed for that. The jacket is meant to be a medium weight hard shell (I will weigh it when finished) for hiking. I just haven't made a jacket before. This one is for testing, to see how much the coated nylon shell holds moisture inside the jacket, and because I haven't seen a jacket made DIY.