Nike Men's Golf Aeroloft Vest Body/fill/lining: 100% polyester. Panels/underlay/lower back lining: 85% polyester/15% spandex. Imported Nike Aeroloft technology integrates exceptionally lightweight warmth with targeted ventilation Laser perforations between baffles aid in thermoregulation Stretch knit fabric in the side panels allows for maximum mobility Left front pocket features a media management system Drop-tail hem provides extra coverage