ULTRAHUMAN Ring AIR - Space Silver - Size 9 - Smart Ring | No Monthly Subscription | Size First with Sizing Kit | Sleep Tracking Wearable - Heart Rate - Fitness Tracker

WORLD'S LIGHTEST SMART RING - JUST 2.4g: At only 2.45mm thin, the Ring AIR is the lightest smart ring for men & women. Built from space-grade titanium with a tungsten carbide coating and hypoallergenic smooth inner lining. Waterproof to 100m - swim, shower, and train without taking it off. Syncs and Compatible with iOS & Android. No monthly subscription - every feature included free. Save over £72/year vs subscription-based smart rings BUY THE SIZING KIT FIRST: Ultrahuman Ring sizes differ from standard ring sizes. Purchase the Ultrahuman Sizing Kit first, which includes a ring sizer, to accurately determine your size. The Ring AIR is available in 10 sizes (5-14), ensuring a comfortable, secure fit. Using the sizing kit helps you avoid returns and exchanges, ensuring you select the right size before purchasing. IN THE BOX: Ring AIR, Wireless Charger, USB-C Cable. ADVANCED SLEEP TRACKER, RECOVERY & FITNESS RING: Track every sleep stage - REM, Deep, Light, and Wakefulness - plus sleep debt and resting heart rate. Your Dynamic Recovery Score combines HRV, heart rate, and skin temperature to tell you when to push hard or rest. Monitor stress, SpO2, steps, and calories round the clock. 20+ dedicated workout modes track cardiovascular response. Your step counter, activity tracker, and health ring in one - lighter than a 1p coin. WOMEN'S HEALTH, PREGNANCY MODE & AFib DETECTION: Track ovulation, menstrual cycles, and fertility with multi-biomarker precision. Predict a 7-day fertile window and pinpoint ovulation. Unique Pregnancy Mode delivers trimester-specific insights - the most comprehensive health ring for women available. AFib Detection monitors your heart rhythm nightly, identifying early signs of Atrial Fibrillation with daily medical-grade reports. Pairs with NHS App-compatible data exports for GP consultations. POWERPLUGS - PERSONALISED HEALTH TOOLKIT, NO SUBSCRIPTION: Modular health apps built on your biometric data - Circadian Phase Alignment (optimise your body clock), Caffeine Window (best time for coffee), Screentime Impact, and Cardio Adaptability. Available in 15+ languages. Pair with Ultrahuman M1 CGM for real-time glucose tracking. Every feature - sleep tracker, heart rate monitor, HRV, recovery - included free on the Ultrahuman App. No hidden costs, ever.