Unger's Professional 18" Combi Refill Sleeve is a replacement refill sleeve for Unger's 18-inch Combi, extending the life of your window cleaning tool. The Microfiber sleeve holds more water than conventional materials. And durable, reinforced seams make it washable up to 500 times. The simple design with a self-adhesive strap closure ensures the sleeve stays in place. Professionals and consumers look to Unger cleaning tools for quality and durability. construction, or workmanship.