The Reebok Compression Arm Sleeves provide support whilst aiding blood flow to keep you warm. The compression fit snugly fits the shape of your arm to offer you maximum muscle support. Additionally, the stretch bonded cuffs ensure that it securely remains in place throughout your run. There is an inner breathable fleece which wicks away sweat and also provides warmth in cold weather. For safety, the sleeves also have a highly reflective honeycomb design to help you be seen in low light.