・ Shifts slightly when running ・ Feels like it might blow away in the wind ・ But tightening it too much gives me a headache, etc. This HAT aims to alleviate these stresses. The entire inner circumference of the hat is made of stretch material, achieving "less slippage," "less likely to blow away," and "not too tight." Color: Black Size: 58cm Brim Length: Approximately 6cm * Please note that these measurements are approximate due to manual measurement. We will ship the item in a compact manner, taking care to prevent damage to the product. Thank you for your understanding.