The Nomad Sport Strap is crafted from durable LSR silicone, known for being naturally biocompatible, antimicrobial, and hypoallergenic. This makes it comfortable, safe, and soft on your wrist. Key features include waterproof LSR silicone, hypoallergenic properties, and compatibility with all Apple Watch models from Series 1-9, SE, and Ultra versions. It has been tested to endure a 72-hour salt spray exposure per ASTM B117 standards, ensuring robust durability.