Independent laboratory testing shows Mulberry Park Silks’ pure mulberry silk generated 34% less friction than cotton during controlled fabric-to-hair evaluation.
This independent laboratory study evaluated hair-to-fabric friction using recognized industry testing methods under controlled conditions.
What Was Tested:
All materials were prepared using standardized protocols to ensure consistency and accuracy.
Conducted October 2025.
This independent laboratory study evaluated hair-to-fabric friction using well-recognized testing methods commonly used in the hair care industry.
What Was Tested
All materials were standardized before testing to ensure accuracy and consistency.
This independent laboratory study evaluated hair-to-fabric friction using well-recognized testing methods commonly used in the hair care industry.
What Was Tested
All materials were standardized before testing to ensure accuracy and consistency.
The difference in friction between silk and cotton was statistically significant, meaning the results are highly unlikely to be due to
chance.
Lower friction means hair moves more smoothly across the fabric surface during sleep — reducing drag and minimizing resistance.
It’s softness you can feel — supported by measurable data. After reviewing the data, Dr. Harold Siegel, board-certified physician and hair transplant surgeon, noted:
“The most impressive part is the clear 34% reduction in friction using multiethnic hair. Scientifically, this confirms that fabric choice is not just about feeling good but about physically reducing force on the hair shaft. While this matters for everyone, it is even more critical for curly or textured hair types that are naturally more prone to breakage.”
Not all silk is created equal.
The silk used in this study reflects the same standards found across Mulberry Park Silks products:
Performance begins at the fiber level — and ends with a smoother sleep surface.
While you sleep, your hair moves continuously across your pillowcase. The surface either allows it to glide or creates resistance.
Higher-friction fabrics may contribute to:
We believe in sharing the science behind our products. A consumer-friendly summary is provided here, and the full laboratory report includes detailed methodology, statistical analysis, charts, and raw data.
Dr. Harold Siegel is a board-certified physician and hair transplant surgeon. He graduated from Nova Southeastern University after earning his Bachelor’s Degree in Psychology from the University of Florida. He completed his residency at Palmetto General Hospital, specializing in Urgent Care and Emergency Medicine.
Dr. Siegel later trained under Dr. Matt Huebner, mastering the exclusive HUE Method before joining Natural Transplants Clinic in Fort Lauderdale. He focuses on patient-centered hair restoration and has reviewed the Mulberry Park Silks friction study, offering commentary based on his clinical expertise.
Dr. Maressa M. Alejandro is an internal medicine physician specializing in preventative and medical care for adults and seniors. She earned her medical degree at Ponce School of Medicine in Ponce, Puerto Rico, and has been in practice for more than 20 years.
She completed her internal medicine internship, residency, and fellowship — including additional fellowship training in geriatrics and primary care — at Saint Vincent’s Hospital in New York City.
Dr. Alejandro is board-certified by the American Board of Internal Medicine, licensed in multiple states, including Arizona, a member of the American Medical Association, and has received numerous honors throughout her career. She reviewed the independent friction study and provided clinical commentary based on her expertise in preventive medicine and skin barrier science.
