Leatt Jacket MTB Therma Flow 5. 0Windproof Outside, Breathable Fleece Inside The Leatt Therma Flow 5. 0 Jacket blocks cold wind and keeps you warm, while letting your body breathe, perfect for high-output rides in chilly conditions. Its custom-developed double weave fabric combines a windproof, water-resistant outer shell with a ventilated fleece interior made with lightweight, thermally efficient Graphene yarn. Built without a laminate, it maximizes airflow while still sealing out the elements with a PFAS-free dirt- and water-resistant coating, seam-taped construction, and snug elastane cuffs. The Ride Adaptive Hood (RAh D) features a patent-pending magnetic system that keeps it in place, either fixed to your helmet so it won't blow off at speed, or secured to your back so it won't flap like a parachute, while the unique Climb Vent connector allows you to ride with the jacket fully unzipped when airflow is needed on long climbs. It works great on its own or as a midlayer under a shell when the weather turns. Made with Bluesign-approved fabrics, the Therma Flow 5. 0 jacket is built for the cold when you bring the heat. Features Specially developed fabric for Leatt with a double weave construction Inner layer is made with Graphene - a super light and strong yarn with superior thermal properties Block fleece inner layer has ventilation channels3 pockets with YKK zippers Ride Adaptive Hood: three-point fully adjustable hood that fits over helmets with patented magnetic hood system (keeps the hood fixed to the helmet at speed or secured to the upper back to prevent flapping, helmet magnet included)Sizing Size Extra Small Small Medium Large Extra Large XX-Large XXX-Large Arm Length (cm)74 - 76cm76 - 78cm78 - 80cm80 - 82cm82 - 84cm84 - 86cm86 - 88cm Arm Length (in)30 - 30. 5"30. 5 - 31"31 - 31. 5"31. 5 - 32"32 - 33"33 - 34"34 - 35"Chest Circumference (cm)91 - 96cm96 - 102cm102 - 106cm106 - 112cm112 - 116cm116 - 122cm122 - 127cm Chest Circumference (in)36 - 38"38 - 40"40 - 42"42 - 44"44 - 46"46 - 48"48 - 50" | Leatt | Jacket Mtb Thermaflow 5. 0 Men's | Size Small In Black