One can never go wrong having back-up hand warmth. The NRS Glove Liners, made of insulating polypropylene, add extra warmth on cold days without adding bulk so you can still be one with your paddle. Pair them with any NRS gloves. Insulating and moisture-wicking polypropylene is known for its ability to add extra warmth. The interior is lightly brushed and silky soft against your skin. Thin enough to slip inside another glove. Thick enough for much welcomed extra warmth.