GREAT for hot weather. Fabric is single layer cotton/Spandex fabric. Perfect weight, breathes well, will stretch to fit somewhat. Dries fairly quickly. Large, cool fit that sinks down to the ears for good coverage and retention while allowing some air circulation around the head. Alas! Soft mesh on the side made contact with Velcro in the wash- resulting in a hole! Could be more durable there. There's a cord loop stitched to the crown on the inside rear...would prefer it were stitched to the bottom rear sweatband, where it would be more useful for hanging and for clipping the thing to you with a tether. I detest the large logo irremovably embroidered right on the front. OR should be paying me to be their walking billboard.