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, 3" x 3", 10/bx, 4 bx/cs (Continental US+HI Only) 14-21 Days