Consumers only wear technology on their faces if it aids survival (e.g., prescription glasses) or enhances their appearance. Meta's VR headsets fail this test, while the Ray-Ban collaboration succeeds because it is a desirable fashion item first and a piece of tech second.

The 90 plans a bilateral data exchange with platforms like Apple HealthKit and Whoop. This strategy allows a new device to immediately provide value by correlating its unique data (UV exposure) with established metrics (sleep quality), creating novel insights for users from day one.

Startups are overwhelmingly focusing on rings for new AI wearables. This form factor is seen as ideal for discrete, dedicated use cases like health tracking and quick AI voice interactions, separating them from the general-purpose smartphone and suggesting a new, specialized device category is forming.

Tech companies learned from the failure of Google Glass that functionality alone doesn't sell wearables. The primary adoption barrier is aesthetics, or passing the "Ugly Test." As a result, partnering with established fashion brands (e.g., Meta with Ray-Ban, Google with Gucci) has become the default go-to-market strategy to ensure products are stylish and socially acceptable.

For a device worn on the face, fashion and comfort are non-negotiable prerequisites for adoption. Meta believes a user will not wear an uncomfortable or unfashionable device, even if its AI is functionally superior. This "style first" approach dictates their partnership with brands like Ray-Ban.

The sales growth of smart rings has surpassed that of smartwatches, indicating a consumer shift toward less intrusive technology. Users increasingly want the data-tracking benefits of wearables without the constant distraction of a screen on their wrist. This trend favors 'hidden tech' that integrates seamlessly and invisibly into daily life while allowing for traditional analog accessories.

By collecting novel, on-body data like personal UV exposure at scale, startups like The 90 can create a valuable asset. Partnering with pharmaceutical companies and universities to provide this data for research not only creates a revenue stream but also builds a deep scientific moat.

The success of a medical wearable is no longer determined by clinical efficacy alone. These devices are merging with consumer electronics, meaning factors like being ultra-thin and aesthetically pleasing are now critical for user adoption. This requires balancing usability, manufacturability, and clinical performance from day one.

The 90 wearable reframes a complex biological process into an intuitive metric: 'sun debt,' the idea that skin processes sun exposure for up to five days. Creating simple, memorable concepts like this helps educate users and drives habitual engagement with the product.