All Products

Reusable sizing kit designed for confidence and convenience. Includes 8 pieces covering sizes 6 through 13, compatible with AIZO rings and other brands. Clear results, lightweight plastic, and comfortable handling for repeated use and accurate ring sizing.

A featherlight sizing kit that makes ring fit effortless, enabling precise fingertip biomarker readings for sleep, recovery, and overall wellness, with an ultra-thin, durable design you can wear daily and order your correct Ultrahuman Smart Ring size.

Experience a smarter, stress-free way to find your perfect Herz ring size—test multiple sizes at home, wear throughout the day, and order the P1 with the right fit every time. Compact, reusable, and ideal for gifting.

Discover your perfect ring fit with the JANGJANG Sizing Kit for Oura. This precise finger measuring tool covers sizes 4–15 in a sleek white kit, delivering accurate, comfortable sizing and confidence in your Oura Ring purchases.

Experience secure, flawless ring fit with the SmartRing kit. Each sheet has 20 clear 6x20 mm strips to resize loose rings invisibly, with soft, skin-friendly silicone for all-day comfort on smart tech and fashion rings. Easy to cut and apply, durable and long-lasting.

XUMIUZIY Smart Ring Health Tracker Sizing Kit provides an effortless, accurate way to determine the perfect ring size before purchase. Compact, portable, and suitable for all fingers and both hands, it ensures comfort and confident shopping.

Give the gift of health with a seamless sizing kit to determine the right size and finish for the Oura Ring 4. Simple steps, wearable sizers, and a final titanium ring, with a 24-hour wear test for the perfect, confident fit.

The Oura Ring Gen3 Sizing Kit helps you discover the perfect ring size before you buy, using unique Gen3 sizing. Test on any finger and hand to ensure comfort, reliability, and a confident transition to the Gen3 ring.

Discover the AMOVAN Smart Ring Sizing Kit for precise, hassle-free ring measurements. This compact tool helps you find the right size before buying, ensuring daily comfort and a confident, perfect fit for smart wearables.

Discover precise finger sizing for Oura Ring Gen 4 with the Mikovivi Smart Ring Sizing Kit. Includes US/EU/UK tapes, durable PP construction, and portable design for accurate pre-purchase measurements at home or on the go.

The Oura Ring 4 Sizing Kit helps you find your perfect fit before purchase. It guides quick, accurate sizing so you can wear comfortably from day one, try different sizes, and feel confident your ring sits securely on your finger.

YWXTW invisible ring size adjusters keep your Oura and smart rings secure during workouts and daily wear. 1:1 fit, waterproof and sweat-resistant, with easy cutting to 0.5–2 sizes. Includes 120 pieces for long-lasting use and secure, accurate monitoring.

Gwenland Smart Ring Sizer helps you find the right fit before buying. It offers eight sizes to match your finger shape for comfort and accuracy, improves measurement precision, and pairs with the companion app for easy setup and tracking.

Grcfumo 8-Pcs Smart Rings Sizing Kit helps you find the perfect ring size with a simple, reliable measurement. Covers sizes 6 through 13, supports all fingers, and avoids half-size guesswork for comfortable, accurate wear.

SZJCLTD’s 6-pack invisible ring size adjusters deliver a precise, snug fit for Oura Gen4/3 and Samsung Galaxy Ring. Made from soft, skin-friendly TPU, they stay nearly invisible and reusable with a curved design and water-friendly adhesive.

The YWXTW Ring Size Adjuster delivers a secure, feather-light fit for your Oura Ring and compatible models. It offers oil resistance, anti-fingerprint coating, waterproof durability, a discreet thinner side, and a simple install with clear instructions and included accessories.

Effortless solution to loose rings. Four discreet sheets slip inside your ring to create a snug, comfortable fit without changing its appearance. Works with most rings for men and women, in four color options for blending with any style.

SZJCLTD 160-piece invisible sizing kit fits Oura Ring Gen 4/3, Galaxy Ring, and Ultrahuman Ring AIR. Includes 8 sheets in black, nude, and clear for 15–20mm sizes. Soft TPU, residue-free adhesive, invisible inside the ring, easy to apply.

The Oura Ring 4 in silver blends health tracking with everyday style. Measures sleep, activity, heart rate, and wellness so you can wear it 24/7. Includes sizing kit for a precise fit and seamless setup in the Oura app.

Sleek titanium smart ring tracks sleep, activity, heart rate, and stress with up to seven days of battery life. Comfortable daily wear, discreet style, and seamless iOS/Android syncing, plus Oura Membership for personalized insights and wellness tools.

The Oura Ring 4 in Silver tracks sleep, heart health, activity, and daily biometrics with a slim, water-resistant titanium design. Enjoy up to 8 days of battery, seamless app insights, and precise sizing with the included sizing kit for accurate data from day one.

Oura Ring 4 in silver, size 11, offers a lightweight titanium design for daily wear. It tracks sleep, readiness, activity, heart health, stress, and women's health with personalized insights, up to 8 days of battery life, and includes a sizing kit for a perfect fit.

The Oura Ring 4 Stealth in size 10 is a discreet titanium smart ring that tracks sleep, heart rate, activity, stress, and cycle data. With up to 8 days of battery and a precise sizing kit, wear comfort and health insights are effortless.

Experience the Oura Ring Gen3 Horizon Stealth with a discreet titanium design and all-day wear. Track sleep, activity, and recovery with precise in-ring metrics, long battery life, water resistance, and seamless data in the Oura App for personalized guidance.