surundo Silicone Sport Band for Whoop 4.0 – Adjustable

The surundo Silicone Sport Band is a breathable, adjustable replacement strap designed to securely fit the Whoop 4.0 tracker for comfortable everyday and workout wear.

This lightweight silicone band swaps simply with your Whoop 4.0 and focuses on comfort, durability and sweat resistance. It uses soft, skin-friendly silicone, a secure locking design, and a wide adjustment range so you can dial in a snug fit for running, swimming, or all-day wear without tools or fuss.

How does this band stay comfortable during long workouts?

The band is made from flexible, soft-touch silicone that resists irritation and dries quickly after sweat or water exposure. Its breathable profile reduces heat buildup and chafing so you can keep your tracker on during extended sessions.

• Soft, skin-friendly silicone for reduced rubbing
• Quick-dry, washable material after heavy sweating
• Lightweight construction for minimal wrist fatigue

Will it fit my wrist and my Whoop 4.0 tracker?

Surundo engineered this strap to fit wrists between 5.9" and 8.26" (150–210 mm), covering most adult sizes. The strap includes an easy adjustment system and precise cutouts so the Whoop 4.0 sensor and charging port remain accessible.

• One-size adjustable for 150–210 mm wrists
• Secure locking design to prevent accidental release
• Precise openings for sensors and charging without removal

Is the band durable enough for water and outdoor sports?

Yes—the silicone resists water, salt, and sweat, making it suitable for swimming, hiking, cycling, and everyday outdoor activities. The material is designed to withstand frequent cleaning and the mechanical stresses of active use.

• Waterproof silicone holds up to swimming and showers
• Washable and quick-drying for frequent outdoor use
• Flexible and stretch-resistant for long-term wear

How easy is installation and removal?

Installation is tool-free and fast: the band snaps into the Whoop 4.0 housing and can be removed with a one-click motion. That simplicity keeps switching bands quick and lets you charge the tracker while it stays secured in the strap.

• Tool-free snap-in design for quick swaps
• One-click disassembly for easy band changes
• Leaves charging access unobstructed while mounted

Who is this for? The surundo Silicone Sport Band is aimed at active Whoop 4.0 users who want a comfortable, low-maintenance replacement strap that handles workouts, water exposure and daily wear. It suits runners, swimmers, gym-goers, commuters and anyone who prefers a soft, breathable band with a secure fit and easy installation. Note: surundo replacement bands are aftermarket accessories and are not affiliated with or endorsed by WHOOP.