SKU: AW19419 Insulation Type: PrimaLoft Weighs: 116g (Medium) Insulation Format: Woven - Durably Warm OMM's new, updated Rotor Vest is the ideal insulating layer, providing a phenomenal amount of warmth in a durable, lightweight package that proved to be very versatile, even when wet.  OMM says The best Insulation … Rotor Insulated Vest