According to a 2024 research report by the International Association of Cosmetic Chemists, the average opening Angle of the cuticles in dyed hair is 42.3°, resulting in a 230% higher rate of water loss than that in undyed hair. The use of sleeping bonnet that meets the 19-mmmeter standard can form a dynamic moisturizing layer with a thickness of 0.03-0.05 millimeters. Fourier infrared spectroscopy detection shows that its silk protein fibers can adsorb 35% of their own weight of water molecules, stably maintaining the microenvironmental humidity on the hair surface at 60-65%RH (only 35-48%RH in the naked sleeping environment). Experiments conducted by the Korea Beauty Technology Research Institute confirmed that after people who dyed their hair wore sleeping bonnet at night, the median moisture content at the hair tips reached 29.7% the next day (17.2% in the control group), the closure integrity of the cutile increased to 91%, and the fading cycle of the semi-permanent dye was prolonged to 5.8 weeks, far exceeding the 3.2 weeks in the conventional environment.
In the field of heat damage protection, data from the German Skin Research Center in 2023 shows that when dyed hair is exposed to hot air at 180℃, the rate of water evaporation reaches 2.3 milligrams per second. Nighttime care for users of sleeping bonnet can reduce the accumulation of heat damage by 43%. Its silk protein layer controls the fluctuation of scalp temperature within ±1.2℃ and reduces the probability of ionic bond breakage caused by the repeated opening and closing of cuticles by 37%. Statistics from high-end salons in Los Angeles show that the annual touch-up frequency of customers who regularly use sleeping bonnet has decreased from 5.2 times to 2.3 times, and the maintenance cost per hair dye has been reduced by 48%. Among them, the mulberry silk material with a density of 22 microns contributes 78% of the protective effect.
For chemical exposure scenarios, in a swimming pool with a chlorine content of 1.5ppm, 23% keratinolysis occurs in dyed hair after soaking for 20 minutes. The antibacterial sleeping bonnet containing 0.8‰ silver ions can reduce the chloride ion penetration rate by 71%. MD Anderson Cancer Center has verified that it keeps the disulfide bond breakage rate of bleached and dyed hair within 7%. Parisian stylist tracking data shows that the color saturation loss of people who used this product after soaking in seawater was only 9.8%, thanks to the physical filter layer formed by the pore structure of 3.2±0.5 microns, which diluted the salt crystal concentration to 0.09 grams per cubic centimeter.
The cost-benefit model shows that after purchasing $45 of sleeping bonnet, the average annual care expenditure of the hair dyeing population decreased from $517 to $184, delaying the touch-up cycle by 42%, and the return on investment calculated by the MIT Consumer Lab reached 142%. Nielsen’s market report indicates that the repurchase cycle of this category is 97 days, which has driven the market penetration rate of hair dye care from 12% in 2021 to 31% in 2024. The TikTok topic “SilkSaveDyedHair” has accumulated 210 million views. 92% of the empirical videos confirmed that the rate of dryness and forking after dyeing decreased by 51%, confirming the core value of the physical barrier of silk in retaining moisture after dyeing.