size of interior cap?

the interior of the hat is large. It fits my head quite loosely. I've been using the cap since Nov. 2022 and have noticed a big difference in the thickness of my hair line in front and middle. I use it everyday. The diameter of the cap is approximately 25-27 inches.

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🔴 Light up your confidence with science-backed hair regrowth!

SMART PROGRESS TRACKING - Bluetooth-enabled app lets you monitor hair growth and stay motivated with reminders.
EFFORTLESS DAILY ROUTINE - Just 6 minutes a day with an automatic timer fits seamlessly into your busy lifestyle.
CLINICALLY PROVEN LASER POWER - 304 precision lasers deliver deep follicle stimulation for natural hair regrowth.
DISCREET COMFORTABLE DESIGN - Lightweight cap fits under hats for invisible, on-the-go treatment anytime, anywhere.
FDA CLEARED DERMATOLOGIST RECOMMENDED - Trusted safety and efficacy backed by clinical studies and medical approval.

The Capillus PRO S1 is an FDA-cleared, clinically proven laser therapy cap featuring 304 medical-grade lasers that stimulate dormant hair follicles for natural regrowth. Designed for busy professionals, it offers a quick 6-minute daily treatment with a comfortable, discreet fit and Bluetooth connectivity for progress tracking via a dedicated app. Visible results typically appear within 12-24 weeks, making it a cutting-edge, convenient solution for managing hair thinning and loss.