**Main Fabric:** The outer layer is constructed from nylon/Oxford cloth—materials that are waterproof, abrasion-resistant, and breathable. The inner lining features a skin-friendly fabric, ensuring comfortable wear without causing skin irritation.

**Cooling System:** The back and front chest areas are designed with multiple independent compartments specifically intended to hold ice packs or Phase Change Material (PCM) gel packs.

**Securing Mechanism:** The sides feature **extra-wide Velcro fasteners** for adjustable sizing, accommodating various body types. This allows for a snug, secure fit that prevents shifting, ensuring the cooling elements remain in close contact with the body for maximum cooling efficiency.

**Ice Pack Configuration:** Typically supplied with multiple food-grade PE ice packs or gel packs; these are reusable after refrigeration and provide a sustained release of cooling energy.