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Assos Thermobooster P1 long-sleeved jersey, a versatile, ultra-breathable, easy-to-store thermal layer for high-intensity training, updated with the addition of pockets to allow it to be used as a jersey when it’s cooler, or as an intermediate layer for added protection from the cold when temperatures get colder and weather conditions more challenging. The new thermal fabric is a highly stretchy ladderproof material that follows the lines of the body and provides excellent aerodynamics. It is breathable enough to support even moments of maximum exertion, and when temperatures rise or training becomes too intense, ThermoBooster P1 can be folded up like a rain jacket and easily stored in the jersey pocket. The versatile fabric and fit that conforms to the body like a second skin allow it to be used in any season: wear it over a skin layer or summer jersey on spring and fall days, or under a weather protector for added thermoregulation when winter turns harsh.