Polyether impression materials are used for taking impressions when producing dental restorations. Hydrophilic to provide accurate impressions in moist conditions, polyether impression materials come in various viscosities from lightweight/soft to heavyweight and have varying set times. Dispensing techniques can be hand mix, syringe or machine mix to reduce waste and ensure accuracy. Features to look for when choosing polyether impression materials include biocompatibility, acceptable odor and taste, good detail reproduction, good tear strength, easy removal of impressions, sufficient working time with a short setting time, and a long shelf life.