The Brain Shroud™'s thoughtful design includes a unique construction, providing single-layer coverage at the crown of your head and double-layer coverage at the ears; allowing for you to release heat buildup without sacrificing warmth where it's needed. The low-profile and snug fit make this beanie ideal for wearing under a helmet, as a scrub cap or as a liner of any kind, while the style looks sleek as a stand-alone hat. Extended time spent outdoors is made easier with UPF 50+ sun protection, moisture wicking and odor resistant properties of Comfort Shell™, our proprietary tech fabric, for a comfortable and dry outdoor experience. Perfect for all outdoor activities through any weather.