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(TM), our proprietary tech fabric, for a comfortable and dry outdoor experience. Perfect for all outdoor activities through any weather. Fabric Type: Single-layer Comfort Shell(TM) Classic, Double-layer at ears Fabric Content: 61% Polyester/31% Recycled Polyester/8% Spandex Fit Type: Fitted Weight: 1.1 oz Dimensions: 9.75" (W) x 7.5" (L)