Inuteq Bodycool XTreme cooling Vest The Bodycool X-Treme vest is designed to snugly fit your body and achieve the ultimate cooling effect. The cooling effect lasts between 1 and 4 hours depending on ambient temperature, airflow, and humidity. This product performs optimally in low to moderate humidity environments. The amount of airflow determines the cooling effect. Wearing this cooling vest reduces body heat stress, keeps you pleasantly cool, and enhances your endurance and performance. Features: Machine washable Unique cooling technology Easy to use and reuse Lightweight Provides up to 15ºC cooling below ambient temperature 2 to maximum 4 hours of cooling Material: 100% polyvinyl alcohol fabric Polyester breathable knit mesh fabric Sizing: T-shirt size = Cooling vest size Use your T-shirt size as a reference to determine your cooling vest size Specifications: Operation: Soak in water for 1 minute Gently squeeze out excess water Enjoy instant cooling