The wound dressing is a fast wicking, non-swelling polyurethane foam with a highly breathable film backing which prevents wound exudate strike-through and is a barrier to outside contamination while the dressing remains intact without leakage.- Non-Adhesive Foam Dressing, 4" x 8", 5/bx, 6 bx/cs (Continental US+HI Only) 14-21 Days