Thermal Vent Hinged Elbow is designed to prevent hyperextension of the elbow. Crisscrossing adjustable locking straps help restrict range of motion. Medial and lateral hinges provide a hyperextension stop at 0°. Engineered with MVT Micro Ventilated Thermal Technology. Thermal Vent Supports have a soft thermal lining that captures and retains your natural body heat to help relieve pain. The microventilated, breathable membrane is comfortable against the skin and provides a free flow of air which allows the skin to breath. With unsurpassed quality, these supports provide gentle compression and warmth to help reduce swelling and associated pain as well as promote recovery.