ULTRA Silver Foam Dressing, 4" x 5", Flexible, Highly Absorptive Foam Layer. ULTRA and ULTRA Silver foam dressings were designed for circumstances where copious drainage is anticipated and protection from trauma may also be also important. Unlike traditional foams, ULTRA dressings use AFM technology to first spread exudate across the entire foam dressing, maintaining an evenly moist interface between the dressing and the wound bed and utilizing the entire foam substrate. ULTRA Dressings keep the periwound skin dry, the wound bed moist and the harmful exudate away from healing wounds.