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DeRoyal Polyderm™ Wound Dressing 3-3/4" x 3-3/4" Polyurethane Foam, Moderate to Heavy Absorbency, Sterile Effective in management of moderate to heavily exudating wounds. Made of non-adherent, highly absorbent, lint-free polyurethane foam. Thick, soft construction that is extremely conformable and comfortable. Ideal for painful wounds requiring protection and cushioning. Protects granulating tissue for effective healing. Primary or secondary dressing.