In general, we use D as the representative of polyester or nylon fabric.D：Daniel=g/L*9000,Among G is the weight of the silk thread (g) and L is the length of the silk thread (m).It is the weight of the yarn per unit length, is a unit of yarn fineness.The larger the number in front of D, the thicker the yarn, the more wear-resistant it is,mainly used in polyester and other chemical fibers.For example, many backpack bottoms are made of 1000D nylon,it has a very high density and good wear resistance.Then in other parts of the backpack that are not easy to wear, the material can be 420D or 600D Oxford.

T in Oxford fabric,it generally means polyester taffeta.It is a kind of silk imitation material,generally used as tents for the inner and outer tents.For example,210T,the number in front of T means that the sum of the number densities of warp and weft yarns within 1 inch,it's actually a unit of density.People could just as easily say,the larger the number in front of T,so the same area of fabric is heavier.Polyester Tuff is the most used as the lining of clothing, feel smooth and comfortable, elastic and bright gloss bright, not easy to wrinkle and deformation, shrinkage.