Our 3mm fly tying foam comes in two 3" x 4" sheets and is available in a variety of colors for all of your terrestrial pattern needs. These fly tying foam sheets are durable, pliable and float well. We like to use them combined with 2mm and 3mm sheets in patterns requiring additional colors and thickness, such as Morrish Hoppers, Grand Hopper . This foam is also great for all foam flies requiring additional thickness, such as goldenstone and salmon fly patterns.