Jack Wolfskin Sky Thermal Long Sleeve Women's Top The Sky Thermal Long Sleeve Top offers functionality, comfort and active moisture management. This light thermal base layer wicks moisture away from your skin and dries quickly. Featuring Jack Wolfskin's fibre technology for active moisture management, TEXADRI materials work to absorb sweat quickly, wicking it away from the skin and distributing it over a large surface area to effectively increase the rate of evaporation. This results in moisture being better absorbed and transported to the outer where it can dry quickly, minimising the build-up of moisture on the skin for extra comfort. This highly breathable material is also very lightweight meaning there is no unnecessary bulk holding you back from your adventures.