Not suitable for heads with a circumference of 56 cm

Unfortunately, this Uvex sunglasses did not fit on the head of my friend, had already tried various models were always too tight, his head circumference is about 56 cm.Wirklich shame as this Uvex sunglasses would otherwise look good and also of the processing would be nothing to beanstanden.Es is anundfürsich a unisex, one could but think that here is a model for women's or my friend's head really big?