all collar trademarks of p>kappa are generally inverted trapezoid, no matter what style. But there are also a few designs that are square, with kappa words and sizes on the inverted trapezoid, and X large is the size, which means XL is written in English. If it's m, it's MEDIUM. Some genuine kappa are made in our factory without the word ykk, so there is no Ykk trademark. All ykk zippers are only printed with their own trademarks, and almost none are OEM. Whether or not ykk is real, ykk is just a zipper factory. →YKK Vietnam → (YKK) 1 Generally, real YKK clothes are used, which is more exquisite in workmanship and more expensive than ordinary brands. If YKK is used for very cheap clothes, it may generally be fake. The clothes sold by big specialty stores usually use real YKK. 2 If YKK zipper is used for good outdoor clothing, the main zipper of the clothing is generally self-locking (the lid part connected with the pull tab and the slider is movable), and the zipper in the pocket and inside is generally without self-locking device. If the main zipper of a garment does not have a self-locking device, it may be fake. 3 Technically speaking, the real YKK is made of thick materials, with smooth appearance and beautiful printing (both concave and convex), while the fake YKK fonts have everything, and the printing is vague, or the strokes are thin, the pressure is uneven, and there are obvious processing defects. There are many factors involved in the surface coating problem, which is difficult for beginners to distinguish, so I won't say much. 4 If it is genuine YKK, besides the word YKK, there will be other relevant information, and the key parts will also have a small Y or YKK steel seal, which is very standardized. Fake ones are generally only YKK, but good imitations also have relatively complete printing. The teeth of real nylon, resin and invisible YKK zipper are not easy to see from the naked eye, and it is best to distinguish them from the slider and the pull tab. Metal teeth are quite different. YKK uses the technology of square teeth. All the fakes I have seen are round teeth, but square teeth are not unique to YKK. Now domestic manufacturers have begun to apply the technology of square teeth. Founder Tadao Yoshida, unlisted company. (Japan)