Maximum warmth, minimum bulk. Throw this light weight beanie on under your helmet during those extra cold days on the hill to help trap in some heat that has a tendency to escape through helmet vents. The lightweight merino wool combined with flatlocked seams allow this beanie to be wicked comfortable even under your helmet. The merino fabric is also naturally odour resistant so you don't have to worry about the stink that is often associated with synthetic alternatives. The folded band around the opening will adds durability without adding bulk. This is a great option for cold days when the liner in your helmet just isn't enough to keep you warm.