What it does: A rubber swim cap with an added layer of insulation that preserves warmth during cold-water activities while also providing UV protection. Why you need it: Keeps heat in and sun exposure down so you can stay comfortable and focused during diving, surfing, and outdoor swimming in cooler conditions. Key benefits Warmth: The built-in insulating layer reduces heat loss at the head, helping you stay warmer during dives, surf sessions, or chilly pool swims. Secure fit: Designed to adapt to all head sizes and to fit both men and women snugly, delivering a close seal that helps retain warmth and stay in place during active use. Sun protection: Provides protection from UV rays when you’re swimming or spending time on the water. Durable performance: Sturdy rubber construction resists prolonged exposure to saltwater and chlorine for lasting use in both sea and pool environments. Features at a glance Material: Rubber swim cap with an added insulating layer. Compatibility: One-size design suitable for men and women; conforms to various head sizes for a secure fit. Use environment: Built for sea and pool; constructed to withstand salt and chlorine exposure. Function: Thermal insulation, UV protection, and a snug fit for active water sports. Practical use scenarios Cold-water diving: Helps retain head warmth during extended dives in chilly conditions. Surfing in cool surf zones: Keeps you warmer between waves and maintains a secure fit while paddling and riding. Outdoor pool sessions: Provides UV protection and thermal comfort for early-morning or late-season laps. Durability note Built to tolerate prolonged salt and chlorine exposure; the sturdy rubber construction helps maintain comfort and performance over time. Ideal for anyone who wants extra warmth, secure fit, UV protection, and a durable swim cap for sea and pool use.