Texture indicates the relative content of particles of various sizes, such as sand, silt and clay in the soil. Texture influences the ease with which soil can be worked, the amount of water and air it holds, and the rate at which water can enter and move through soil. Soil texture is a classification instrument used both in the field and laboratory to determine soil classes based on their physical texture. Soil texture refers to the relative percentage of sand, silt, and clay within a soil layer. Soil texture refers to the proportion of sand, silt and clay sized particles that make up the mineral fraction of the soil.