E.Joy Online Wide Brim Summer Sun Flap Bill Cap Hat with Neck Cover for Women Free size, with an elastic band at back. Best fit for 55-58cm Block 97.5% or more of sun UV rays The plastic board inserted,the brim is wide and long enough to shade forehead, eyes and cheeks from sun uv ray. Very light and well ventilated to keep you cool in summer. The chin cord will keep it stay safe on head in windy weather. Brand:E.Joy Online, have been certified for US-market and are Fulfilled by Amazon.