A practical guide to the most commonly used dressings in wound care The PMFA Journal Versatel Contact Layer Dressings Velfour Four Layer Bandaging System for Venous Leg Ulcers by Datt Mediproducts Beyond the Bandage: The Science of Total Healing for Venous Ulcers. Venous leg ulcers are notoriously difficult to heal because they aren't just skin woundsthey are a symptom of underlying Four layer dressing in the management of chronic venous ulcers in the outpatient setting of a tertiary hospital in India ScienceDirect