Here are some top smart rings for men with short descriptions:

1. Oura Ring (Gen 3) – Advanced health tracking (sleep, heart rate, stress), ~7-day battery.

2. RingConn Smart Ring – No subscription, tracks heart rate, SpO2, and sleep, ~7-day battery.

3. Ultrahuman Ring Air – Metabolism, HRV, and movement tracking, ~6-day battery.

4. McLear RingPay – Contactless payments, no charging needed.

5. Motiv Ring – Fitness tracking, step counting, security features (discontinued but available).

Let me know if you need a recommendation based on your needs!