I wore this running near my house about 4 or 5 times. This is a running jacket with insulation that combines heat retention and breathability to handle cold winter conditions. The main fabric of the outer shell uses lightweight Pertex Quantum, and PrimaLoft Gold Insulation, which incorporates the highly insulating material Aerogel, is sealed in the front core area. The sleeves use stretch knit with excellent elasticity and heat retention, and ventilation is provided on the sides and back with laser holes. Goldwin Tech Lab researched the differences in body temperature rise depending on the body part, and this item pursues a comfortable wearing experience during winter sports. It is designed with electrostatic care to suppress the generation of unpleasant static electricity. - Brand: THE NORTH FACE - Color: Black - Size: M Thank you for viewing.