I bought a SB jacket from a seconed hand store and I have two questions, First is what did originally corst? Its black and green and has 5k waterproofing and RN# is 87380 anyone know? Second more important one is how do I wash it? It has no intructions in it or anything and I dont wanna ruin it cause it cost to much even second hand. Here is a picture of it. Thank you.