[1] Water's Edge Dermatology: "Satin, silk and bamboo are better for acne-prone skin because they're less absorbent and do not draw oil away from the face." — wederm.com/blog/the-best-pillowcase-for-acne
[2]Anson G, et al. "Sleep Wrinkles: Facial Aging and Facial Distortion During Sleep." Aesthetic Surgery Journal, 2016;36(8):931–938. pubmed.ncbi.nlm.nih.gov/27329660 — Confirms mechanical contact during sleep directly affects facial skin over time.
[3] Ristic N, et al. "Bamboo Fiber Antibacterial Effect: A Review." Textile & Leather Review, 2021. doaj.org/article/1630dd1860c04208809d4ec0608589e0 — Confirms significant antibacterial properties in bamboo fiber.
[4] American Academy of Dermatology Association. "Acne: Tips for Managing." Lists changing pillowcases regularly as a recommended acne management step — implying bacteria in fabric is a contributing acne trigger. aad.org/public/diseases/acne/skin-care/tips