Sportful Size Chart The Hotpack Hi-viz vest is constructed from NanSphere fabric for excellent windproofing and water resistance. A high collar and minimal seaming add extra protection, and a back vent sheds excess heat. It packs down small for easy carry on days with unpredictable weather. Features: - Schoeller NanoSphere water-repellent fabric - Minimal seaming on front to prevent rain entry - High collar for maximum protection - Full front YKK Vislon zipper - Internal stuff compression sack - Back ventilation - 360 degree reflective accents - Reflective elastic binding - Weight: 79g