The synthetic 100g fill offers insulation even in wet weather and the insulation extends to the handwarming pockets. The dense microfibre outer and the synthetic fill can cope with wet and windy conditions and the insulation will not be damaged by getting it wet. t can be put on over any other kit when insulation is needed. With keeping your core warm being one of its core aims, the windproof gilet benefits from Nikwax Analogy Insulator's synthetic fill which is water-resistant and provides an impressive warmth to weight ratio.Nikwax Analogy Insulator's synthetic fill - very effective warming even in wet conditionsPacks down easily into its own secure internal chest pocket2 x insulated zipped pockets