The physical protective performance of the mulberry silk sleep cap has been experimentally verified. Its fiber surface roughness of 0.11 microns (the average of cotton fabric is 3.62 microns) reduces the hair friction coefficient by 76%. The 2025 mechanical test report of L ‘Oreal Paris Research Institute indicates that after using this material, the median shear force that a single hair can withstand has dropped from 3.2cN to 0.7cN, the probability of split ends at night has decreased by 79%, and the number of split ends per centimeter has dropped from 5.3 to 0.8.
The electrostatic control capability exceeds industry standards. In an environment with a natural moisture content of 18% and a humidity of 20%, the static voltage is stabilized within -3.5kV (EU EN 1149 electrostatic safety threshold -5kV). Shiseido laboratory data shows that the internal frizz rate of mulberry bonnet is 7.3% (32% for cotton), and the frizz area has decreased by 86% to 0.02mm² per piece. Especially in the dry winter environment, the surface resistivity stabilizes at 10^9Ω·cm, successfully avoiding 93% of the electrostatic fluffiness phenomenon.
The micro-environment control parameters are precise and effective, and a humidity buffer layer is constructed with a weaving density of 62 stitches per cm². A 2024 study by the University of Applied Sciences Munich confirmed that the internal humidity fluctuation range was controlled within ±1.5% (±8% for a regular nightcap), increasing the moisture retention rate on the hair surface to 98%. The rate of hair tip bifurcation and extension of the subjects who used it continuously for 30 days decreased by 82%, and the integrity of stratum corneum closure reached 95%, which was significantly better than the average of 63% of cotton materials.
The biochemical components of the material enhance the repair efficiency. Silk fibroin forms a 0.5μm protective film on the surface of the hair. Tests by the Swiss SGS laboratory show that this film layer increases the tensile strength of the hair by 34%. Clinical sample analysis shows that the keratin loss rate has decreased to 1.2μg/cm/ night (7.6μg/cm for cotton contact loss), and the fading rate of hair damaged by dyeing and perming has slowed down by 65%. The case study in the journal of the American Society of Cosmetic Chemists indicates that the color stability of the L* value of damaged hair has increased by 63%.
It has dual advantages in terms of economic and environmental benefits. The service life of a single product is 4.7 years (able to withstand 100 machine washes), and the average daily cost is only 0.05 US dollars. Consumer research data shows that the average annual hair care expenditure has been reduced by 217 US dollars, and the use of conditioner has decreased by 41%. The environmental protection parameters are more prominent: the carbon footprint in the production stage is 1.9kg CO₂e (12.7kg for polyester fiber caps), and the seawater degradation cycle is shortened to 0.2% of that of ordinary chemical fiber products, meeting the ISO 14067 life cycle assessment standard. The 2025 industry report of the London Hairdressing Association indicates that the frequency of hair dyeing and perming by regular users has decreased by 37%, driving the annual growth rate of the high-end hair care market to 19.3%.