Prevent Collar Yellowing: This collar protector can effectively protect the collar of the shirt, reduce sweat stains on the collar and so on. It makes light-colored shirts not yellow and easier to clean. Sewing Fastening: This collar protector does not come with self-adhesive tape, you can only sew with your partner to fasten it to your collar, or use separate glue to stick it to your collar. Polyester Fiber Material: This collar protector is made of polyester fiber material, which is very easy to clean, you can easily clean the sweat stains attached to it and keep your shirt tidy. Size: The anti-sweat stains collars are in bundles, one bundle has 20m length, the width of the collar is 30mm, the thickness is 0.8mm. enough to meet your daily needs. Wide ApplicationShirt collar protectors are suitable for a variety of occasions, including collar linings, cuffs, necklines of shirts or t-shirts. They can also be used as sweat-proof liners for a variety of hats such as baseball caps, sun hats, golf caps, tennis caps and more.