Because of the larger design, a size S would be just right for someone who is 175cm tall and of average build. Black cool vest with cooling function using antibacterial material. - Color: Black - Function: Cooling function - Material: Antibacterial material - Condition: Unused INUTEQ-DRY Technology: INUTEQ cooling vests use a special material that allows water to permeate, efficiently releasing body heat and naturally lowering body temperature. It keeps both the inside and outside dry. Easy to use: Open the cap on the back and pour about 500ml of water into the cooling vest, letting the water soak in. Then, open the cap and discard about 200ml of excess water before wearing. Long-lasting cooling effect: Cooling effect for 8 hours to a maximum of 3 days with one filling. As a measure against heatstroke: Can lower the perceived temperature by 5-15 degrees Celsius, reducing the risk of heatstroke. The cooling effect is enhanced by using cold water. INUTEQ-DRY Technology: INUTEQ cooling vests use a special material that allows water to permeate, efficiently releasing body heat and naturally lowering body temperature. It keeps both the inside and outside dry.