Castelli potenza full zip jerseythis potenza full zip jersey is created with a tight knit and lofty fleece on the polartec power stretch fabric to help you keep the heat in leaving enough air permeability to let moisture out the fabric is stretchy and features an added hard face finish with a dwr coating so brief rain showers will run off featurespolartec power stretch fleece fabric with hard face dwr finishexceptionally warm fleece with the just the right amount of air permeability to k