Hydrofera Blue Foam Dressing without Border 2" x 2" 2 X 2 Inch HB2214 Hydrofera Blue CLASSIC Antibacterial Foam Dressing (sized 4" x 4"). It is a sterile, non adhesive polyvinyl alcohol (PVA) foam dressing used in advanced wound care to manage bioburden and promote healing. Buyer's Guide: Hydrofera Dressings Medical Monks Hollister HB4414 Hydrofera Blue Foam Dressing 4 x 4, Martinique Ubuy Amazon.com: Hydrofera Blue Bacteriostatic Foam Dressing 4" X 4", Box of 10 : Health & Household Those who know, know there's no comparison. Hydrofera Blue provides antibacterial and non cytotoxic protection for faster wound healing and helps pull harmful bacteria laden slough, exudate, and debris away from the wound bed,