【Premium Fabric】- Crafted from high-quality cotton, soft and skin-friendly, lightweight, breathable, and sweat-absorbent, keeping you dry and comfortable during sports. 【Stretch Size】- Our running cap fits snugly on the head, ensuring stability without squeezing, suitable for head sizes of 21.25 - 22.83inches/54-58 cm. The lightweight, slouchy design adapts easily to different head shapes, hair volumes, and helmet interiors. 【Suitable for All Seasons】- From brisk morning runs to sleeping in cooler rooms, from daily commutes to indoor workouts—this lightweight beanie adapts to your lifestyle. Also ideal for wearing under helmets or during hair loss recovery. 【Widely Applicable】- Whether indoors or outdoors, whether dancing, fitness, rock climbing, cycling, hiking, or running our hat sweat liner is an ideal choice. The comfort of the sleep cap makes it suitable as a sleeping companion as well. 【After-Sales Service】 - If you have any questions, please feel free to contact us via email, we want all our customers to be happy and satisfied, we will always make it right for you in your best interest.