Sports Bluetooth Earbuds Design

I'm looking for in-ear wireless Bluetooth earbuds designed specifically for sports and fitness enthusiasts. The earbuds must prioritize water resistance due to sweat and outdoor conditions.

Key requirements:
- In-ear design for secure fit
- Must be water-resistant

Ideal skills and experience:
- Experience in designing wireless earbuds
- Knowledge of water-resistant technology
- Understanding of ergonomic in-ear designs for active use