Nike Sportswear Synthetic-Fill. Women's Jacket. STAY PUFF IN THE FACE OF COLD. The Nike Sportswear Synthetic Jacket offers warm, lofty comfort ideal for cool, wet weather. Larger baffling provides a modern look and holds the high-loft insulation in place. Synthetic insulation: Synthetic high-loft insulation mimics the look and warmth of down and retains its heat even when wet. Secure storage: Zippered pockets store your stuff on the go. They're lined with fleece for a warm feel. Taffeta fabric has a soft, smooth feel. Fleece cuffs pull down over your hands to keep them warm and covered.