VENOTRAIN ULCERTEC STOCKING X LARGE ANKLE 30 - 33cm UNISEX SHORT 39mmHg VenoTrain® ulcertec - the special compression stocking for the treatment of venous ulcers. Venous ulcers are the most severe type of chronic vein problem. VenoTrain® ulcertec has been developed to provide a successful and comfortable compression therapy solution for this condition. It exerts required gradient compression on the lower leg to allow the ulcer to heal and will not slip.