The Infinity Replacement Double Hung, made of Ultrex Fiberglass, is the smart answer to a traditional favorite. You'll be amazed at its smooth effortless operation. Quality hardware and advanced design result in a double hung that makes cleaning so easy, you may actually have volunteers. Make the smart window choice and your window worries will become a thing of the past. The Infinity Replacement Double Hung, made of Ultrex Fiberglass, is the smart answer to a traditional favorite. You'll be amazed at its smooth effortless operation. Quality hardware and advanced design result in a double hung that makes cleaning so easy, you may actually have volunteers. Make the smart window choice and your window worries will become a thing of the past. Both upper and lower sash operateEasy tilt feature makes cleaning simpleAvailable in Standard, Cottage or Oriel style