The Extreme Jacket: Made in the USA ( -35˚F to 50˚F) Layer System: Fortress Clothing uses a patented insulation with an outer shell to repel wind and water, and the extreme layer to trap heat and wick away moisture. Insulating Materials: High-quality patented insulating materials such as synthetic fibers and specialized fabrics are used to retain body heat effectively. Moisture Management: Insulation are designed to wick moisture away from the skin, keeping you dry and comfortable. Windproof and Water-Resistant: Many garments are windproof and water-resistant, providing an additional barrier against the elements. Durability: Fortress Clothing is known for its durability, ensuring that its insulating properties remain effective over time. Layering Options: The clothing is designed to be a Mid-Layer, allowing you to add providing flexibility in staying warm with this layer and a shell. Features: – Patented AERIS ™ 500 Insulation Technology (½" / 13mm of loft) Maintains Warmth soaking wet or dry. -35˚F to 50˚F – Exceptional warmth-to-weight ratio – Fully Adjustable Elastic Waistband – Elastic Cuffs for use Tucked into or over Boots – Wind Resistant Sizing Chart: Materials: – 100% Polyester Mesh Lining – 100% Polyester Micro Rip-Stop Taffeta with DWR Finish *Made in the USA Weight 16 oz Dimensions 12 × 12 × 3 in SIZE XS , Small , Medium , Large , XL , 2XL , 3XL , 4XL