Many brands advertise instant coolness and claims like "lowers perceived temperature by 3°C" for cooling apparel (냉감 의류). But not all items perform the same: some use true functional fibers while others are simply thin fabric. The key measure is Q-max, which rates contact-cooling by how quickly fabric draws heat from skin — higher Q-max means stronger cooling. Materials matter: nylon or polyethylene-based functional fibers and special high-thermal-conductivity yarns often cool better than 100% cotton. Choose by use: breathable pieces suit commuting and daily wear, while outdoor sports need added UV protection (자외선 차단) to avoid skin damage. Also check wash durability—cooling can fade in cheap items, whereas yarn-level functional treatments last longer. Experts recommend reviewing test reports or certifications (e.g., KATRI) and prioritizing material and functional specs over marketing phrases.
