Dacron double velour grafts were evaluated in an animal [dog] preparation and utilized in 318 patients undergoing elective aortic reconstruction for aneurysmal and occlusive disease. Dacron double velour forms an adherent inner lining, preclots easily, is soft, pliable and easy to handle and suture. Clinical studies revealed excellent patency with a low incidence of prosthesis related complications. No clinical evidence of overt prosthesis failure, dilation, aneurysm formation or pseudointimal embolization occurred during an average follow-up of 2.3 yr.