We are picky about glass towels (and everything else related to car detailing!), but specifically how the glass towels we use absorb grime and hold up over time. We love these microfiber cloths because of how well they perform to remove streaks and residue from glass, windows, and mirrors, how nicely they glide across the glass when using, and how long they last. We've been using these for years, and we can definitively say that these are THE best glass towels on the market, period. Made with the Highest Quality AA-Grade 70/30 Blend Korean Microfiber Size: 16" by 16" 500 GSM (Grams per Square Meter) Care Instructions Always wash new microfiber towels before you use them Wash your microfibers with like-colors to avoid dye transfer from darker towels to lighter towels Like all high quality microfiber towels, machine wash your microfibers with a microfiber-specific detergent like Esoteric Microfiber Wash. Do not wash your microfibers with any cotton fabrics, and do not use any fabric softeners! TIP: You can use any temperature water in the wash process. At Esoteric, we prefer warm to hot water. Dry your microfiber towels on low heat, without dryer sheets. Do not iron your microfibers (we've never heard of someone doing this, but you never know!). At Esoteric, we like to dry on low heat for a longer time period, rather than drying more quickly on a higher heat. The hotter the towels get in the drying process, the higher the probability that they individuals fibers will melt together, losing their softness and absorbency. 500 GSM (Grams per Square Meter) Care Instructions Always wash new microfiber towels before you use them Wash your microfibers with like-colors to avoid dye transfer from darker towels to lighter towels Like all high quality microfiber towels, machine wash your microfibers with a microfiber-specific detergent like Esoteric Microfiber Wash. Do not wash your microfibers with any cotton fabrics, and do not use any fabric softeners! TIP: You can use any temperature water in the wash process. At Esoteric, we prefer warm to hot water. Dry your microfiber towels on low heat, without dryer sheets. Do not iron your microfibers (we've never heard of someone doing this, but you never know!). At Esoteric, we like to dry on low heat for a longer time period, rather than drying more quickly on a higher heat. The hotter the towels get in the drying process, the higher the probability that the individuals fibers will melt together, losing their softness and absorbency.