When sourcing anti-embolism stockings (AES), the most critical factor is graduated compression technology. Ensure the stockings provide a pressure profile of 18 mmHg at the ankle, decreasing to 8 mmHg at the upper thigh. The material composition should ideally be a blend of Polyamide (Nylon) and Elastane (Spandex) to ensure breathability and elasticity. Additionally, look for features like an inspection toe hole for easy monitoring of skin color and temperature, and silicone stay-up bands to prevent rolling, which can cause a tourniquet effect.