Featuring a brushed inner layer, the 2XU Thermal Compression Top supports the upper body muscles, while providing warmth and unrestricted movement for cool weather training, competition, or recreational activities. . Lightly brushed fleece interior fabric provides added warmth and comfort an ideal base layer for cool weather or snowsports. PWX Flex fabric: Circular knit construction with 360 degree stretch, powerful compression, and durability. PWX Flex fabric delivers optimum support to bicep, tricep, forearm, deltoid, pectoral, and core stomach muscles for all day support helps maintain posture, breathing, and agility. Graduated compression increases blood circulation for improved recovery and reduced muscle stiffness post exercise. Graduated compression in the forearms promotes circulation, while unrestricted movement ensures optimal performance. Powerful Invista Lycra for exceptional fit, support, and recovery. High filament yarns wick sweat away from the skin to the fabric exterior, keeping you dry and comfortable. Raglan sleeve construction for unrestricted movement. Flatlock seams for chafe free comfort. Odor resistant fabric with UPF 50 sun protection. Garment should be tight, but not painful or restrictive.