Act as a product designer with 5+ years of experience in wearable tech. Create a high-resolution, photorealistic 3D render of a [smart hair tie] that monitors [tension levels] to prevent hair breakage. The design should feature a [minimalist, sleek aesthetic] with a subtle LED indicator (choose: blue/green/red) to show tension status. Include close-up details like the [flexible sensor band] and [silicone grip texture]. The background should be a [soft pastel studio setup] with natural lighting to highlight the product's ergonomic form. Use a [model with mid-length wavy hair] to demonstrate the hair tie in use, showing both loose and secured styles. Add a small HUD overlay displaying [real-time tension metrics] for a tech-savvy touch.