We're all in the sweaty skull crowd. After all, the perspiration has to go somewhere. The only debate is how we deal with it. Plenty of us understand the appeal of a cotton cycling cap, but it has its limitations the brim is hard to fit under the helmet, and the cotton stays damp after absorbing moisture. When you have to deal with sweat, take a good look at the roboFoil Cap from Assos. It's a cap designed for both the modern age and modern helmets. It's an ultralight cap made from two different synthetic materials. The cap features an ultra thin design with taped seams to both minimize volume and to guarantee that the cap won't create any pressure points on the skin. Overall, the construction makes the roboFoil easy and pleasurable to wear under your helmet. The two bands down the middle of the roboFoil are the lightweight, wicking SPX fabric. The side panels create ventilation, which is why they're made with a wicking polyester mesh. The Assos roboFoil Cap is available in the color White Panther. Sizes are Assos specific 0, I, and II. Size 0 fits 48 53cm head, Size I fits 53 58cm heads, and Size II fits 58 63cm heads.