The quality of a glove or mitten is determined based on its fabrics, technical materials and performance under certain conditions.
Good - Good quality gloves and mittens will keep your hands protected from the cold but lack some of the technical features found in other gloves.
Better - Better quality gloves and mittens are made with durable materials that will help keep the cold and moisture on the outside. They may have insulation for added warmth and technical features for moisture management.
Best - Hard-chargers will want the Best quality gloves or mittens. They boast heating properties and insulation, technical features, have better fit and feel and usually have plenty of bells and whistles.