Long Sleeve SIX2 Carbon Underwear Merinos wool, breathable and thermoregulatory in any weather condition. The long sleeve covers all the upper limbs, keeping the skin cool and interposing to a possible upper garment, as well as protecting it lightly from the fresh currents in the case of wearing a short-sleeved upper garment. The throat collar finally protects the throat from temperature fluctuations and fresh currents.